Cliched dialogue exchanges

[private joker]

JBB brought up the cliche of cocking a gun to Get Serious. That started the thread leading to Ebert's glossary of movie cliches. But the glossary doesn't touch on dialogue, and I get consistently annoyed by the cliches writers keep harping on in their scripts. Post your (least) favorite movie dialogue cliches.

2 examples:

* Someone is saying or doing something, and they think their significant other is not around. But then they look over the shoulder and there he/she is at the doorway:

A: How long have you been standing there?
B: Long enough...


* Two characters are having a heart-to-heart talk that helps one of them get over some psychological drama. When the talk is over, the sage is walking out of the room, but gets stopped.

A: Hey, Dad...?
B: [turning around] Yeah?
A: Thanks.
B: [nods, walks out]