(Pretentious math major walks into classroom with professor correcting quizzes).
MM: Sir, I don't know why this question is wrong. I triple-checked my answer, and it has to be 999.
Prof: I know, and it was supposed to be. I have a tragic announcement to make to the class tomorrow.
MM: What's that?
Prof: (looks down on his quizzes) For the first time ever, someone has killed a number...
MM: What number?
Prof: ...the number 999.
MM: GASP!