Forgetting

Dude: Don't forget to forget about the meeting tomorrow

Stan: Wait...I thought they said the meeting was canceled

Dude: It is, that's why I said don't forget

Stan: Why forget it?

Dude: So that you don't remember

Stan: But I'm not going

Dude: Good, now you're remembering!

Stan: I thought you wanted me to forget

Dude: And you're doing an excellent job

Stan: But if you want me to forget, then how am I going to remember?

Dude: By remembering to forget

Stan:...huh?

Dude: Forget it