And of course, when someone (Giles?) says there couldn’t possibly be a stupider idea, Oz comes back with “We could throw hummus at him.”
Happy meals on legs. Good line 
Gah, can’t stop, too many coming back!
Spike having Harmony “role-play” as the slayer.
Xander’s snoopy dance
Adam: Scout’s honor
Spike: You were a boy scout?
Adam: Parts of me.
Willow comforting Spike as if they’d had a bad time in bed together after the chip wouldn’t allow him to bite her in “The Initiative.”
Xander: “I hope we’ve all learned something today. Beer is…”
Buffy: "FOAMY!!
Xander: “As long as that’s clear.”
–from “Beer Bad”
“You could never hope to grasp the source of our power. But yours is right here.”–The combination of Buffy, Giles, Willow and Xander, as she pulls the nuclear battery out of Adam’s chest.
I like Spike’s whole “Happy Meals on Legs” speech
“The truth is that Darth Rosenberg is on her way into town and none of you has the midichlorians to stop her!” Best line ever.
[sub]And I’m sure that some “helpful” person will be more than happy to correct my paraphrase or spelling.[/sub]
Okay, I’m going to try to keep my list somewhat smaller than Infinite Jest. Luckily, many of the good moments have been taking care of, so I’ll just try to put in a couple more good ones…
The whole scene where Giles, Xander, and Buffy think that Willow’s been vamped in Doppelgangland is cute, especially after she comes in. “Say, you all didn’t happen to do a whole bunch of drugs, didja?” Hee.
The matter-of-fact way that Buffy asks if anyone else “burst into song” in Once More, with Feeling. In fact, that whole scene between “Going through the Motions” and “I’ve Got a Theory.”
Two moments from Innocence that I liked a lot: Willow’s speech after she saw Xander and Cordy that included the “We Hate Cordelia” club, and Oz’s “freezeframe” speech in which we all learn to love him.
The end of Band Candy. Anthony Stewart Head and Kristine Sutherland do such a good job with body language after Buffy stalks off… Hee hee.
Giles’s “Yes, that’s exactly the most appalling thing you could have said” from Hush. And, from the same episode, Spike’s look of utter contempt after Xander tries to phone Buffy in his voiceless state.
The ending of Lie to Me has not been mentioned, as far as I recall, but it is at least worthy of note.
The scene where the Scoobies rally around Tara in Family always gives me goose pimples.
Uhm, okay, exhaustion just overtook me, so maybe I’ll continue later.
I don’t think anyone mentioned it…
The scene in Afterlife where Spike sees Buffy for the first time after being woken from the dead.
“How long was I gone?” - “Hundred fourty-seven days yesterday.”
Season 1: The Puppet Show
A certain classic horror movie is subverted when we find out what the deal with the spooky puppet is…
Season 2: Passion
Giles beats the crap out of Angelus with a baseball bat. I could watch David Boreanaz get hit with a big stick all day.
Season 3: Doppelgangland
Vamp-Willow pretends to be gay to put the shits up her human counterpart. The face that launched a thousand 'ships.
Season 4: Something Blue
Most of it. Especial highlights include Amy’s de-ratting and Giles’s “Kiss The Librarian” mug.
Season 5: Real Me
The Body is far better as an ep, but the Game of Life scene is hilarious. “Can I sell the children for more cash?”
Season 6: Seeing Red
The death of Tara, of course. Thus ended the sad saga of a pointless, annoying, unconvincing character who in forty or more episodes did nothing but provide Willow someone with whom to be gay. I brought popcorn.
(We also now get to point at the pathetic 'shippers in denial and laugh. Another plus, I can’t help but feel.)
[spoiler]Season 7: Get It Done
The shadowcaster scene. Eerie and effective.
Runner-up award goes to the use of the theme from A Summer Place in Him. [/spoiler]
The opening teaser from “Reptile Boy”- “So, why is she singing?”
From “School Hard”- “Oh, puh-leeze! If every vampire who claimed he was at the Crucifixion was actually there, it would have been like Woodstock… I was actually at Woodstock. That was a weird gig. I fed off a flower person and spent the next six hours watching my hands move.”
“Becoming, Pt 1”- “It’s a big rock. I can’t wait to tell my friends. They don’t have a rock this big.” I actually want some guy to present me with an engagement ring just so I can say it, fake English accent and all. Also, I’ll second, or fourth, Spike’s speech about why he wants to help Buffy save the world.
“Living Conditions”- the look on Buffy’s face at the end as Willow bites into the uneaten half of her sandwich…
“Where the Wild Things Are”- Xander and Anya arguing in the ice cream truck, and Xander says, “You want to have sex? Fine, we’ll have hot, sweaty, big sex,” then looks out to see the herd of children and their parents looking at him.
“The Initiative”- dorm scene was quite possibly the funniest thing ever shown on television.
“Something Blue”- Buffy walking the little plastic wedding-cake bride and groom up Spike’s arm humming “Here Comes The Bride”
“Restless”- Anya “It’s alright. I think I’ve learned to steer by gesturing emphatically.”
Oz panicking in “Graduation Day”.
At the beginning of “Wild at Heart”, Oz gently waking Willow from her dream- “It’s in the sandblaster.” “What’s in the sandblaster? Willow, come back to me…”
Spike punching Tara in the face in “Family”- seems mean on the surface, but it was probably his first actual semi-unselfish act. He was willing to risk intense pain to prove Tara wasn’t a demon.
The whole exchange between Spike and Riley in “Into the Woods”.
The bit at the end of “Intervention” when Buffy goes to Spike’s crypt pretending to be the Buffybot to see if Spike spilled the beans to Glory about Dawn being the Key. When she realizes he didn’t, she gives him the best kiss ever exchanged on the show.
“Into the Woods” again- Riley standing on the helipad, very pointedly not watching for Buffy’s approach.
“I Was Made to Love You” at the party when Buffy says something about preferring to hang with Xander than be hit on by good looking guys- Xander : “I think I liked it better when you were kicking me in my puffy groin.”
Spike bitch-slapping Xander in “The Gift”
“Once More, With Feeling”, Anya going heavy metal on the bunnies.
Dawn: “Oh, my God, you guys will never believe what happened at school today!”
Buffy:“Everybody started singing and dancing?”
Dawn: “I gave birth to a pterodactyl.”
Anya: “Oh, my God, did it sing?”
When they were doing the Group Sing (Where Do We Go From Here), Spike saying, “Oh, bugger this” and walking out of the room.
“Dead Things”- Buffy: “We missed the bed again” Spike: “Lucky for the bed.”
“Beneath You”- Spike stalking the rat, giving it a lecture on etiquette. The Glance. Also, the whole last five minutes. It made me cry, and I don’t cry at television shows.
“Same Time, Same Place”- “I’m insane. What’s his excuse?” I almost fell off the couch laughing. Also, Poseble Dawn.
I like the scene where Spike, being tortured by Glory, insists that the Key is Bob Barker from “The Price Is Right.”
I don’t remember which episode, but the Scoobies are patrolling with Riley. He’s being all commando with handgestures and combat gear. They wear brightly colored clothes and are munchings chips.
Good Willow’s “Where did these come from?” in Evil Willow’s bustier.
The Scoobies’ reactions to Buffy’s hand gestures during the overhead projector scene in “Hush.”
Principal Snyder getting eaten by the Mayor/snake demon in “Graduation Day, p.2”
Spike’s look of contempt/resignation as he starts singing to Buffy in “Once More with Feeling”
Mr. Trick: “If this is the part where you tell me that I don’t fit in here in your quiet little neighborhood, you can just skip it 'cause, see, that all got old long before I became a vampire. Do you know what I’m saying?” in “Faith, Hope, and Trick.”
The Mayor checking “Become Invincible” off of his List of Things To Do, among others on the list is “PTA Meeting”
Any time Giles draws examples.
Gaspode, that’s from Fool For Love. According to the commentary by Doug Petrie, Riley moved like “a big jungle cat.” I can’t even type that with a straight face…
Evil Death, in Doppelgangland, Vamp Willow isn’t pretending to be gay, she really is, just like the human Willow. (Actually, to be more precise I’d say that Vamp Willow is more predatorily omnisexual)
So that’s why she’s shacked up with Xander. :rolleyes:
Personally, I believe that scene to be the strongest indicator that Willow isn’t gay. Consider: an evil demon based on a human encounters the human it is based on. Is it more likely that demon will get affectionate with the former human self it has already demonstrated contempt for, or that the demon will seize the day and use its intimate knowledge of its counterpart to wind the human up as severely as possible?
No flamewars, by request. 
Oz: “I mock you with my monkeypants”
Willow’s litte wave when she’s pretending to be Evil Willow.
Spike’s face when he realizes it was Buffy who kissed him, not the 'bot.
Spike’s face when he realizes that Buffy has, err, umm, just hopped on board, so to speak.
Faith-in-Buffy taunting Spike (which is, I believe, the moment he started falling in love with her.)
About 99% of the time Oz is onscreen saying anything.
Don’t ask me to explain or justify it, because I can’t, it’s one of those things that is beyond explanation, but the scene where Buffy and Riley have been having sex for about 3 days already, and they are having some more, and Buffy says something like “Never stop touching me” is just hot for me. Like I said, can’t explain it.
And while I don’t know that I would call this a “favorite moment”, because it’s painful, I think the moment when Joss acheived true greatness (at least for a sloppy sentimental fool like me) is the moment when Angel’s soul returns, buffy kisses him goodbye, and runs him through with a sword sending him to hell forever (or so she believed). That was when Joss entered The Pantheon of the Storytelling Gods.
If you read further down, you’ll note that I clarified my comment that Vamp Willow is a voracious omnisexual (aka fucks anything that moves).
In addition, I own the Season 3 box set, and putting on that episode: there’s this exchange between Buffy, Willow, and Angel in the episode:
[quote]
Willow: I’m so evil and skanky, and I think I’m kinda gay!
Buffy: Remember, Will, a vampire’s personality has nothing to do with the personality of the person it was.
Angel: Well, actually (See’s Buffy’s “shut up” look)…Good point.
[quote]
Not to say that you don’t make an interesting case, but I think that my POV is better supported by the evidence.
In the warehouse where Snyder and Joyce are seated together, and Snyder asks her, “So, are you two like, going steady?”
Then Joyce rolls her eyes in disgust, gets up and walks away.
Oh, and in that same episode, when Snyder quickly gets in the car with Buffy and the others because he doesn’t want them ditching him. Buffy starts driving and Snyder yells out, “Summers! You drive like a spaz!”
Just a couple scenes that I don’t think have been mentioned yet:
The Master’s line to the Chosen One, “Taking a life is a serious thing. I’m not talking about a human life, of course.”
the whole monkey hand scene at The Magic Shop from “Life Serial”, especially the Geek Trio riffing on Monty Python: “The monkey hand has ceased to be!”
Larry saying what a great year the Sunnydale High football team will have if it can just keep the mysterious deaths to a minimum.
Principal Snyder’s comments about spontaneous cheerleader combustion.
-Cordelia: “How do we know you’re not zombie Giles?”
-Giles: “Cordelia, do stop being tiresome.”
-Cordelia: “It’s him.”
-Cordelia: “One of these days you’re going to wake up in a coma.”