While answering questions at Kansas State University, Rummy didn't appreciate a question from an audience member and quite casually flipped him the bird.

Video-WMP Video-QT (2:13 mark)

Q: If you were going to give yourself a letter grade for your performance as Secretary of Defense--what grade would that be?

Rumsfeld: Oh, I'd let history worry about that...

Right back at you--Rummy.

(h/t Joe and Jordy)