Portal was full of such lines, but I can't remember any word for word.
Max Payne 1 had a few good ones:
- Max says "Thank You" if you shoot out certain blaring alarms, and also if you shoot out a speaker playing elevator music.
- A conversation between a pair of enemies in one of the last levels after a long elevator ride:
Thug 1: I hate being stereotyped. I'm not a cold blooded killer; I'm a nice guy. I love my wife, I have two boys and I'm very proud of them. You just have to make ends meet. And if that means I have to shoot someone now and then... hey, it's just my job from 9 to 5.
Thug 2: Well.... not exactly from 9 to 5, but I hear ya.
Edgeworth in one of the Phoenix Wright games:
"OBJECTION!! ...I was trying to think of something to say while objecting. I didn't. Sorry."