funny/cool/fun things your teachers did

I remember one of my teachers was at the blackboard and all of a sudden got the urge to scratch himself. Well, he forgot that chalk was on his fingers and white dust marks were all over his pants, but he didnt notice. He walked around class asking whats so funny because we were all laughing, but noone answered. Well, eventually, another teacher came to borrow something, and falls over laughing. She, now crying, tells him to "EXAMINE HIS PERSONAL ZONE" and he flips out. He sat there wiping away at his crotch for at least 5 minutes and needless to say, he got the name, Mr White and Wipes