Jump Off the Empire State Building Joke

This Joke is meant for Scouts BSA.

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Two men are drinking in a bar at the top of the Empire State Building.
First says to the other, "I discovered last week that if you jump from the top of this building, the winds whipping around the skyscrapers will stop your fall and blow you right back up here."
"No way," replied the second man.
"Here, I'll prove it," said the first, and he jumped out the window. As he predicted, he fell a few feet and then returned right back through the window.
"Amazing!" exclaimed the second man, "Let me try that." He jumped, and fell all the way to the pavement below.
The bartender says to the first man, "You know, Superman, sometimes you're not very funny."