It’s a combination of Russel’s paradox, and the joke about a clown named pagliacci. Russel’s paradox is: there’s a barber in town who only shaves men who don’t

It’s a combination of Russel’s paradox, and the joke about a clown named pagliacci. Russel’s paradox is: there’s a barber in town who only shaves men who don’t shave themselves. Does he shave himself?