There's Something About Mary

Liar Liar had some great Jim Carrey outtakes at the end.

Toy Story and Toy Story 2 had some good outtakes.

Bowling for Columbine has some good ones. Like when the guy playing the "Bank Manager" forgets his lines, or when the "Kmart Executive" slips and falls through a hole in the soundstage.

The Howling. Great to see John Carradine and Slim Pickens flub their lines in the same scene!

Agreed. The outtakes were far funnier than the movie (though that's not saying much).

I like the one from Boondock Saints.

From Dusk Till Dawn. Clooney gets so pissed at himself every time he messes up a line.

I'm surprised nobody's mentioned The Usual Suspects. It was something that was put together more for the cast and crew than for an eventual DVD release, but I think it's funny as hell.
Bryan Singer(?)'s crappy rapping about Keyser Soze, and Benicio Del Toro stuttering "I had a finger up my ass tonight."

I think X-Men has the best one.

"Sorry! I am in the WRONG movie!"

LoL, "THERE IS NO SEYSER KOZE!"

Don't forget the "See you next Wednesday" gag in An American Werewolf in London!

I second that X-men blooper. That was classic. I really wish they would release the blooper/gag reel that they showed at conventions though. They sound really funny.

I don't think I've watched too many or have a personal favorite, but one part of the bloopers on the movie DOWN WITH LOVE, ewan mcgregor asks the director "who am I again?" and the director goes "obi wan kenobi"

The only blooper I remember laughing outloud over is the final one on From Dusk Til Till Dawn DVD. Where Clooney picks the stool off Tarantino and tosses it away, only to have it fall and crack Quentin right on the forehead. That looked painful.

Scarface Anniversary Edition - The TV Version - a look at the two versions

Snatch - (hidden feature) 90-second collage of gunplay and swearing clips from the film, either in their uncensored glory, or a bleeped-out version.

I love the Jackie Chan ones (the cell phone one in Rush Hour always cracks me up). Sometimes you gotta wince at the ones where his stunts go bad. Ouch!

Requiem for a Dream, one of the most serious and depressing films ever made, has this absolutely hilarious bit in the out-takes, with Marlon Wayans doing his lines while performing a Jar Jar Binks impression. I don't remember the exact lines - "Meesa wanna score some H", or something.

The one I thought of was Jason Lee cracking up on the Chasing Amy gag reel. Everytime I watch it a break out laughing right along with him.

esspecially the scene in 2 where he goes under the little window, i sure thought originally it was fake when i saw it in theaters.

The ones on Grumpy Old Men and Grumpier Old Men are pure gold.


Paul

Forgot to add, the Jackie Chan ones are excellent too.


Paul

I always look forward to Jackie Chan outtakes at the end of the movies. My wife and I always laugh at the ones for There's Something About Mary

The outttakes on the Chappelle's Show Season 1 set Fricken slay me...same with the ones on How High.

Best ever though...the ones from Canonball Run under the credits. That will always be the classic. There are definitely better blooper reels, but CbR will always be the OG of blooper reels.

The ones on FRIENDS: The Complete Sixth Season and The Complete Seventh Season are so side-splittingly hysterical, I consider myself fortunate to have only watched both of these while I was alone, 'cause I nearly coughed up a lung laughing (most embarrassing to onlookers, I'm sure it would have been). For anyone who doubts that the cast really are great friends with one another, here's your proof...