A joke taken and adapted from the World in Common discussion list :
Karl Marx died and is sent to Hell.
Three days later, the Devil, desperate , telephones Saint Peter, begging for an exchange.
"This one here has already unionized all the demons , nobody is working. I can't carry on like this!"
So they made the exchange and two days afterwards, the Devil telephones again to see how things were going.
"So then? How is God getting on with that Marx ?"
"God ??" answered Saint Peter. "He doesn't exist!"