One moment r which always akes me laugh is from It Happened One Night. Clark Gable is busy teaching Claudette Colbert how to hitchhike but having absolutely no luck himself so, whilst he's sitting down sulking, she walks to the roadside when a car approaches, lifts up her skirt and moves her leg back and forward and the vehicle screeches to a halt.

There's just too much but I'll put one up. ;)
May have to turn the volume up a bit...from Smashing Time (1967).

http://www.youtube.com/watch?v=F3HISEM-C64

Glad to see some vintage stuff get a mention, here's some comedy mo's, forgive me but can't remember some titles.
Laurel & Hardy delivering a piano(any moment you like)
Buster Keaton standing still while the front of a house falls on him.
Abbott & Costello "who's on first".
Holy Grail's "some day lad, all this will be yours".
Death Race 2000 "blaming it all on the French"(that got a huge laugh in the cinema)
W.C. Fields telling off an infant at the dinner table, only for the kid to bean Fields with a salt shaker when he turns to leave(ouch).
Laurel & Hardy getting into a tit for tat shin kicking fight.
Indy can't be arsed so he just shoots the big guy with the sword in Raiders.

Yep,those evil French! :lol:

The Music Box.

Some great final moments.
Dirty Mary Crazy Larry.
Night of the Living Dead.
Dirty Harry.
The Wild Bunch.
2001.
DR Strangelove.
Living Dead at the Manchester Morgue("wish you were alive again so I could kill you again"):lol:
Shutter Island.
Goodfellas.
:pop2:

Awesome choice.

I totally forgot -

The " I LOVE IT " sequence from The Naked Gun 2 1/2.

When Marty first meets 50's Doc Brown in BTTF. "ONE POINT TWENTY ONE JIGAWATTS!?!"

I clean forgot about that moment in Steamboat Bill Jr, which was a huge risk for Keaton as I read there was only 6 inches of space between him and that window frame on each side so we had to stand in exactly the right place at exactly the right time otherwise he would have been seriously injured.

Yeah, Keaton is vastly underrated(when's the last time any of his stuff was on tv) no-one has ever topped some of his physical gags, no stuntmen for him. A true legend.:clap: