OK, here is another one:
Man: Is this the right room for an argument?
Mr. Vibrating: I've told you once.
Man: No you haven't!
Mr. Vibrating: Yes I have.
Man: When?
Mr. Vibrating: Just now.
Man: No you didn't!
Mr. Vibrating: I did!
Man: Didn't!
Mr. Vibrating: Did!
Man: Didn't!
Mr. Vibrating: I'm telling you, I did!
Man: You did not!
Mr. Vibrating: Oh I'm sorry, just one moment. Is this a five minute argument, or the full half hour?
Man: Ah! Just the five minutes. :D
