Frazz by Jef Mallett. The kid says, "An average teacher might assign three pages of homework. A mean teacher would assign ten pages." Frazz says, "Ok." The kid replies, "You said 'mean' and 'average' were the same thing." Frazz says, "Mathematically." The kid replies, "I just don't want to believe the average person is mean." I love the play on words.