6months ago
Teacher: You're going to fail this class if you don't do more work.
Me: No I'm not.
Teacher: Yes you are.
Me: No I'm not.
Teacher: You have an F.
Me: A high F. A D is enough for credit.
Teacher: Well, have fun failing then.

Yesterday
Teacher: Chris, your grade on the semester exam was... 94. Which takes your total grade up to... *types it into software)..........
Me: So, what is it?
Teacher: 61.3.
Me: Which is a D, yes?
Teacher: Yes.
Me: Which means I get credit?
Teacher: Yes.
Me: In your face.
Bell rings, I walk out