Some teacher did this once when I was back in college... only it was a male with a big belly...
He wouldn't happen to be Professor Sherman Klump, would he...?
Why!?Keine-sensei!My breasts!?Got a question?Alright who did it?! Who played this prank on me!!Well umm, on your breasts...Huh?EH!?On the board, the words are disappearing!~pure white~And, therefore...Writing on Blackboard