A man walks into a bar, has a few drinks and asks what his tab was. The bartender replies that it is twenty bucks. The guy says, "I'll bet you my tab double or nothing that I can bite my eye." The bartender accepts the bet, and the guy pulls out his glass eye and bites it.
He has a few more drinks and asks for his bill again. The bartender reports that his bill now has doubled. The man bets the bartender he can bite his other eye. The bartender accepts knowing the man can't possibly have two glass eyes. So the man takes out his false teeth and bites his other eye.
