A man walks into a bar, but can't decide what to drink. So he sits down and observes for a bit.
Now, at this time, a man finishes his drink, then saunters to the window. He casually opens the window, climbs onto the sill, and shouts, "I'm going to jump out this window, fly around the building three times, then come back in."
The newcomer is stunned, and watches the apparently crazy man jump out the window. To his suprise, he does indeed fly around the building three times, then returns unharmed. He returns to the bar and orders again.
The undecided man goes up to the bar and asks for the drink that the flyer just ordered. He downs the drink in a rush, runs to the window, and yells, "hey, watch this!" He opens the window, and stands in it as the whole bar goes silent, and everyone watches. The man jumps, and plummets 6 floors to his death.
The bartender calmly turns to the flyer and remarks, "Superman, you're a real ass when you're drunk."