Two guys drinking at a bar, and one fellow says to the other, "I'll bet you six drinks that I can go to the top of that five-story building across the street, jump off, and right before I hit the street I'll just float back up to the top." The other fellow says, "Hell, that's a bet!"
So they both go up to the top of the building, and the first guy jumps off. Just as he's about to smash into the street, he stops, and then floats back up to the top. The second fellow says, "Yeah, ok, if you can do it," and jumps off. He hits the street, breaks several bones, banged up, bruised and bloody. The first guy drags him back into the bar and demands his six drinks from the poor fellow.
The bartender brings him the six drinks and says to him, "You know, Superman, you can be a real asshole sometimes."