I remember in Revenge of the Sith, when the actor playing Vader yells "nooooooooo", at what is supposed to be the emotional climax of the trilogy, the theater roared in laughter.
The Patriot (2000) dull Mel Gibson movie, as far as i can recall, anyway random dude gets head cleanly lopped off with a cannonball, buddies and i played too much UnrealTournament that day not to hear the "HEADSHOT" anouncer in our heads.