Young Sherlock Holmes.
Any number of Jacky Chan movies. Not scenes as such, but outtakes. (Woohoo! Watch Jacky fall down and fracture his skull!)
Re: Burgess Meredith:
“He’s ridin’ the skin boat…ta TUNA TOWN!!!”
Off the top of my head, noting that some of these may have only happened in the theater:
Lethal Weapon 3 Riggs and Murtaugh pull up to yet another exploding building.
Constantine We see Constantine’s sidekick ascend from his grave.
Matrix Reloaded Preview of Matrix Revolutions
Wild Things Intercuts explain the entire movie with Neve Campbell’s character calling all of the shots
Episode 2: Attack of the Clones Sound: Heavy Breathing of Darth Vader
I’m sure there are others, but that’s all I recall for now.
-DF
Monsters Inc., where Pixar – instead of doing “outtakes” as in their previous movies – instead gave us
Mike, Sully, and their talent-show musical, “Put That Thing Back Where It Came From.”
Masters of the Universe.
**Adventures in Babysitting
Ferris Buehler’s Day Off
The Howling
**
Didn’t we do this thread once before?
Kids in the Hall: Brain Candy - we find out what happened to Mrs. Hurdicure that sent her into a depression.
I missed the JAY & SILENT BOB and the CONSTANTINE ones! J&SB was my friend’s fault (she always cuts out soon as the credits role) but I’m amazed that I missed CONSTANTINE’s as I went to that one alone.
Dickie Roberts: Former Child Star was as dreadfully unfunny as most David Spade vehicles (who is this talentless nebbish sleeping with and how good could he possibly be when he’s doing it?), but has a video at the end (an all child-star chorus) that is worth renting the movie for. (The DVD extended version is also worth a look- forget the godawful movie, just watch this, if nothing else for the opening lines by Maureen “Marcia Brady” McCormick:
Thank you for letting me into your living rooms,
for letting me entertain you be-fore bed,
but if one more of you calls me Marcia,
I’ll crush your fucking head!
Damnit…I was gonna say that! 
Well, I’ll have to go with my second-favorite…“Looks like Chuck’s takin’ old one-eye to the optometrist!”
For those unaware of that scene, the man in the cab was Howard Jarvis, who led California’s property tax reform ballot measure in 1978.
Jimmy Hollywood, that poor Joe Pesci flick, had a great scene either while the credits rolled, or immediately after.
Pesci plays an unsuccessful actor, but manages to become a media sensation through media manipulation (there’s more, but unessential to what I’m telling).
Credits roll. Cue Harrison Ford, in an uncredited cameo:
Harrison Ford: Is this a principal role? I mean, ‘cause, I came here for a principal role! They said it was a principal role.
Woman: Well, this is what we’re casting today.
Harrison Ford: This is two lines. I’m not doin’ two lines. I didn’t come here for two lines. I was told this was a principal role!
Old School has a scene in the closing credits.
Godzilla: Tokyo SOS
Hellboy
So, if I were to ever watch a movie with has a scene after the closing credits, should I assume that it will never win any major awards?
I was upset Passion of the Christ didn’t do this with their credits.
**Anchorman: The Legend of Ron Burgundy ** had outtakes during/after it’s credits, including, inexplicably, one from Smokey and the Bandit.
**Ghost World ** had an outtake after the credits too.
Eurotrip had intercut scenes with credits, and after the credits finish there’s a full scene of Michelle Trachtenberg trying to hitchhike. She ends up taking off her shirt, but alas we only get to see her from behind.