A man is drinking in a bar on top of a skyscraper in the afternoon...

Another man walks in and orders a drink. After a while, the first man walks over to the window, opens it up and jumps out.

Horrified, the other man runs over to the window at which time the first man flies back through the window and lands on his feet.

The second man says to the first, "what the fuck just happened here?"

The first man replies, "the way these skyscrapers are, they create a wind tunnel so strong you can just jump out and float in mid-air until it pushes you back through the window."

The second man says, "bullshit, that's impossible!"

"Try it yourself," says the first man.

"No way! You do it again." Says the second.

So the first man jumps out the window as the second man watches and just floats in mid-air until he eventually comes back in the window.

"My God that's amazing!, says the second man. "Do you think it will work on me?"

The first man looks the second up and down and says, "absolutely! You're just about the same build as me. It will totally work!"

So, nervously, the second man climbs up on the window ledge, jumps out, and promptly falls to his death 50 floors below.

The first man sits back down at the bar and the bartender comes over and says,

"Superman, you're one mean drunk!"