Meet the barber, a man who has a paradox problem on his hands. Or should we say, on his head? He can't stop cutting hair, yet he can't escape the logic that's got him in a bind.
It's all about the classic barber dilemma: if he's in the town and all the men in the town go to him and get a haircut, and the barber himself is a man, then is he not a man who has a haircut? And if so, then must he not go to another barber, who is not a man, to get a haircut? Or is he not a man who has a haircut, who must go to a woman barber? Or... well, you get the idea.
Or, if you're feeling particularly absurd, you could just ask the barber to cut off his own beard. It's not like he hasn't done it before...