Because the farce is strong with that one.
He got into treble.
He wrote "1 + 0 = 0" and then spent the rest of the lesson trying to rub one out...
THAT'S *NOT* FUNNY!
Not enough cement EDIT: Okay thanks for pointing out that I messed up the wording but the joke is supposed to be the funny part
Yo get off me, homes!
Someone told him there were two Lucilles