A guy walks into a bar with an alligator.
He says "I'll bet anyone here I can put my penis in its mouth and not be harmed". Several people put up some money so he whips it out, and puts his dick in the gator's mouth. After a couple minutes, he whacks the gator on the head and it lets go. The man is unharmed and wins the bet!
Then the man says "anyone else want to try". No one does, except the blonde girl in the back who raises her hand and says "I'll try - just don't hit my head too hard!".
(ta boom tishhhh)