I was in a class once with a reall mean angry teacher. And someones phone rang. She went ballistic. "THE NEXT PERSON WHO PHONE RINGS - They Fail, no appeal...." Like 3 minutes later some girl's phone rings.

So clever, so quick witted. The girl whips it, still ringing, out window. This is on the first floors, so it is just out there, ringing.

Teacher "Whose phone is that?!?" Class, unanimous "I think it's outside."