How about this:
One day a guy was crossing the street when he got splattered by a bus. When the guy opened his eyes after being hit he finds himself on a tropical beach with beautiful topless woman wandering about. The man is a little freaked out by this but he feels relieved that he must have ended up in heaven. As he makes to go towards the women he notices that there is a great long wooden fence stretching down the beach. As he walks up to this fence he hears horrible screaming and yelling as if people are being tortured on the other side.
So, the man starts off down the beach trying to find a hole in the fence where he can look through and see what is happening to all of those people. Suddenly as he is walking he sees the devil walking up the beach towards him.
When the devil finally reaches the man he says, "Hello! Welcome to hell."
The guy looks back at the fence and says, "Wait, if I am in hell then what is on the other side of that fence?"
The devil chuckles and says, "Oh, that is hell too. That is just where all the Christians go, they seem to prefer it that way."