Mitchell!
My husband often quotes The Day the Earth Froze…“Where’s the Sampo?”
So hard to choose…
But probably Pod People. “It has nothing to do with pods, it has nothing to do with people. It has everything to do with PAIN!”
Close second: This Island Earth. I still say “NORMAL VIEW!!!” whenever something dramatic happens. I have even introduced this phrase to people who have never seen a single episode of MST3K.
And for shorts, nothing beats Mr. B Natural. “I’m all messed up. If only an androgynous man would come and visit me.”
But who can forget Ator the Improbable (aka Cave Dwellers)? You know how much Keeffe is in that one? Miles O’Keeffe.
Okay, so he kills a deer, tans the hides, stretches the skins, he makes an anodized aluminum frame, he learns how to extrude and weld all in about five minutes?
Wait, Mr. B Natural is a man???
I’m all confused now 
MST3K was one my must see-programs for years and years. One movie they really missed out on was "Baron del Terror" (The Brainiac). It could easily have been one of their best episodes.
“Brooks and Dunn!”
Depends on what day you ask me. Final Sacrifice, Space Mutiny, Deathstalker…
Every quote on here makes me laugh. I can’t limit it to any one episode.
My friends and I were out to dinner and as we’re sitting down, one of them picks up his sandwhich and says totally deadpan, “Ah ham. I love it.” So of course I have to tell everyone, “You think he likes ham? Wait to you see ME like ham.”
No one else had any clue what we were talking about which only made it funnier.
20 years? REALLY!?
And now I have the Puma Man theme bouncing around my head.
So many to choose from…hmmm…
There’ll always be a place in my heart for the very first one I saw, Time of the Apes:
“Fl-l-l-ling crap!”
“GODO, HELP!”
*“Go to hell? He feeds you, he gives you shelter, and this is how you thank him?!”
*
And then there’s the inimitable Leech Woman:
“Neil…NEIL!”
“Why is there a single meatball in his outbox?”
*“I’m sorry, I was going to get you a drink, but I got held up at the bar.” *
“I love to go to BAR and have SANDWICH.”
But for sheer volume of comedic gold, nothing beats Laserblast:
“My God, if those pants give way, it’ll be like a piano exploding!”
“Ah, the rare male camel-toe!”
“Hello…hello? I’d like to buy some sweet corn!”
“Hey, I really like those flames you painted on…Ohhhhh…”
My Og, has it really been 20 years? You know, when I heard about Film Crew and Titanic, I’ve always held out hope that those ventures would eventually lead to MST’s return to TV. I will never give up that hope. Happy anniversary, MST!
Whenever anyone in my family is watching a movie that fades to black for longer-than-normal, we all say “he…hello…movie?”
Look Polish? Quick, everybody…Look Polish!
“Da-a-ad? Stop shakin’ me, dad!”
Me too, except I use “Are we dead, Mike?” 
I’ve always maintained that Comedy Central was at its peak when it showed nothing but stand-up, SNL reruns, and MST3K. Add in the TDS/Colbert hour and you’d have the perfect channel. I need to break out Santa Claus Conquers The Martians soon; it’s always been my favorite hands-down.
Santa: “We’re going to go out the same way we always do.”
“Guns a-blazin’!”
Re: the Rifftrax sidetrack, I had no idea Neil Patrick Harris did a Rifftrack! I didn’t think you could do a decent riff on Willy Wonka, but the preview on the website had me cracking up. The man can do no wrong as far as I’m concerned. As for which ones you should listen to, Roadhouse is a great one, even though it’s only Mike (I think riffs do better when he has someone to play off of). Oddly enough, as much as I love Weird Al Yankovic, the Jurassic Park preview didn’t grab me. Good songs, but he’s a little too harsh on the ears when he’s trying to be funny and speaking. Most of the Rifftrax with Mike, Kevin, and Bill are solid choices, and the most like old-school MST.
Well?
It STINKS!
And always remember, folks:
Shoot first; ask Christian Slater.