Two men began talking in a bar on an upper floor of an office building.
At one point, one said, "I'm going to let you in on a secret. There's an updraft between this building and the next and it's strong enough to support your weight."
The second man said, "You're full of it."
The first man said, "No, it's true. Watch."
With that, he went out onto the balcony, climbed over the rail and sailed into the air. He spent the next several seconds floating, turning somersaults, doing figure eights, etc. Finally, he climbed back over the rail.
The second man said, "That was amazing. Let me try it."
So he climbed over the rail, launched himself into the air...and plunged screaming to the pavement below.
The bartender looked at the first man and said, "Ouch, Mr. Kent, you're a real jerk when you've been drinking."