Girl: So we think this thing we're asked to prove is actually an unknown result. We think maybe what we're actually supposed to prove is that it's NP-HARD. I don't think it will be hard to prove that it's hard.
Guy #1: This problem makes me NP-hard!
Girl: This problem makes me NP-pissed off.
Guy #2: Better to be pissed off than pissed on!
Guy #3: Unless you're on fire.