… on The Real World 
“Puppy uppers and doggy downers.” If only they really had such things.
Everyone in my family sings Bill Murray’s Star Wars theme:
Star Wars
The theme of Star Wars
If they should bar wars
Don’t bar Star Wars.
In the past week alone my 70 year old dad and my 7 year old son have sung it.
Baseball been beddy beddy good to me.
I just saw this for the first time on his “Best of” dvd. I laughed so hard I almost pissed myself. In retrospect, Carvey might have been one of the best cast members they’ve ever had.
But my most memorable has to be Sinead O’Connor tearing up the Pope’s picture.
In the wake of “We Are the World” and “Do They Know It’s Christmas?”, the all-star charity song on behalf of free-range chickens. They pan across the singer-impersonators and get to … Chris Farley as Carnie Wilson.
::commence pissing myself
Joe Piscopo and Darrell Hammond are both well-known for their Koppel impressions. Most famously, Piscopo imitated Koppel for the “Death of Buckwheat” skit in the 1980’s.
My favorite one time skit is probably the Stand Up and Win bit. Jerry Seinfeld hosts a game show where all three contestants are guys doing Jerry Seinfeld impersonations. They pick a category and finish a joke with a Seinfeld-like observation. Cracked me up the first time I saw it.
And all the questions in each category are of the form “What is the deal with…”. And then Adam Sandler always answers “Who are the ad wizards who came up with THAT?”. Good times.
I didn’t even see that and I’m now laughing so hard I’m getting strange looks.
Here’s a gallery of his impersonations, with unfortunately only a small picture of the “Musicians for Free-Range Chickens”.
I can’t believe no one has mentioned:
Will Farrel / Chris Katain - The Butabi Brothers (the “what is love…” dance club guys)
Jon Lovitz - Tommy Flanagan of Pathological Liars Anonymous (yeaaah…that’s the ticket!)
Will Farell, Chris Parnell, Norm MacDonald, others - Celebrity Jeopardy ( "I’ll take ‘the rapists’ Alex’)
Uncle Jemima’s Sour Mash Whiskey…180 proof per volume.
Pancakes is ready!!!
Not to mention a cameo by Bernie Kopell as “Doc”
samurai night fever
al franken and tom davis’s parody of election commercials: vote for me, “pete tagliani!”
dezi arnez reciting jabberwocky in his cuban accent
paul simon and george harrison singing together
Most of my favorite iconic, significant, edgy, etc moments have already been mentioned by other posters.
My personal most memorable SNL skit, the one that made me laugh so hard that I seriously thought I was going to injure myself, was Will Ferrell doing Harry Caray interviewing Jeff Goldblum. Will Ferrell is funny enough, but what really put me over the edge was Jeff Goldblum so obvously losing his mind trying to stay in character.
Debbie Downer at Disney World
My all-time favorite musical moment was watching the Cranberries sing Ode to My Family… it fit my mood perfectly that evening.
I saw Mr. Mister on when they were accused of maybe playing with the help of recordings… but the story never went anywhere as far as I remember. I do remember thinking they didn’t sound much like their record, but what do I know? 
I was afraid no one remembered or would be afraid to mention this. This is by far my favorite skit.
Predated politically incorrect. Hilarious. My sister and I still run around screaming “Let’s play glass bottom boat!” and “Put on your panty hats, girls!” and we are old.
Gilda Radner in her brownie uniform. “Daaaad… there is a man in my closet.”
James Brown’s Hot Tub.
“Will it make me hot?”
“YEah”
“Will it make me wet?”
“YEah”
“Hah. Well, well well!”
SNL’s most memorable cute skits.
Action-Cats. I want to torture my cat with those.
And the commercial where instead of killed rats you dosed them up with sleeping powder. And there’s rats sleeping everywhere. Adorable!
Also definitely in my Top 10. I always wondered whether Julia Child ever saw the skit herself. If she did, I bet she was laughing right along with it.
Was the Julia Child sketch supposed to be a Monty Python tribute? Eric Idle was the host of that episode, after all, and the Pythons were known for using spurting blood for comic effect (“It’s only a flesh wound!”).
Either “Old Glory Robot Insurance” or the “Interbank” commercial, for me.
No , wait…hell! I almost forgot my old favorite…
Two words…