[Blarg]

Bruce Lee backfisting two chumps who run up behind him without looking in The Chinese Connection. This move reappears everywhere later, perhaps most famously in The Jerk. It'll keep reappearing in some form or another till the end of time.

Other candidates:

Chevy Chase on top of some super hot chick in Caddyshack, drunk off his ass, telling her, "You make me feel like a hundred bucks" and falling off her and crashing to the floor.

Sean Connery cold bloodedly executing a hapless villain after subtly goading him to make a stupid move, in Dr. No. "Your six are up." His first shot as "Bond, James Bond" is also one of the coolest quick moments ever on film.

Giuletta Masina smiling into the camera at the end of Nights of Cabiria.

Jean Paul Belmondo pretty much all through Breathless.

Jean Gabin pretty much always.

Michel Simon pretty much anywhere in Boudu Saved from Drowning and L'Atalante.

Ben Kingsley throughout Gandhi, but especially in the scene where he tells the despairing Muslim child killer how to do something to help make up for the evil he has caused.

Clint Eastwood telling a bunch of toughs in I think it was For a Fistful of Dollars, who had laughed at him coming into town riding a donkey, "I want you to apologize to my ass."

Paul Newman refusing to stop fighting George Kennedy in Cool Hand Luke.

Clive Owen in Croupier at the end looking smugly into the camera as the voice-over says, "I have the power to make you lose."

Honorable mention to David Naughton in An American Werewolf in London. He got a great vacation in Europe, had hilarious friends, got to be a werewolf and literally bite people's heads off, AND got to bang Jenny Agutter. What more could anyone want out of life?