Clue (1985)

Visible crew/equipment: When Mrs. Peacock turns on the cellar lights, a piece of lighting equipment is visible to the left of the screen. (00:47:45)

Wadsworth: The game's up, Scarlet. There are no more bullets left in that gun.
Miss Scarlet: Oh come on, you don't think I'm going to fall for that old trick.
Wadsworth: It's not a trick. There was one shot at Mr. Boddy in the study, two at the chandelier, two at the lounge door, and one at the singing telegram.
Miss Scarlet: That's not six.
Wadsworth: One plus two plus two plus one.
Miss Scarlet: Uh-uh. There was only one shot that got the chandelier, so that's one plus two plus ONE plus one.
Wadsworth: Even if you were right, that would be one plus one plus two plus one, not one plus two plus one plus one.
Miss Scarlet: Okay, fine. One plus two plus one...SHUT UP! Point is, there's one bullet left in this gun, and guess who's going to get it!

Trivia: Professor Plum reveals that he works for UNO, the United Nations Organization, in a branch called WHO, the World Health Organization. As such, he works for UNOWHO (You Know Who).