This guy is visiting the big city on a business trip and decides to treat himself to the best bar in town, which is at the top floor of a fancy hotel. When he goes in, he orders a beer and sits down at the bar.
As he's looking around at the other patrons, a man in a slightly rumpled business suit and glasses walks up to the bar, orders two tequilas, and drains them both in one go. He then runs toward an open window, screams "KOWABUNGA!" and leaps. The man is disturbed at this apparent suicide, but more so by the fact that the bartender and other customers continue to calmly go about their business as if nothing were unusual. He decides to stay in case the cops want to question witnesses.
But after a few minutes, the same man in an even more rumpled suit walks up to the bar and breathlessly orders two tequilas. Slamming them down, he again screams "KOWABUNGA!" and leaps through the window. The man stares at the window in confusion and a few minutes later is startled by the same man again approaching the bar to order two tequilas.
"Excuse me, but didn't you just jump through that window a couple minutes ago, and a few minutes before that?"
"Yup."
"This bar is forty stories above the street! How on earth are you surviving throwing yourself out the window?!?!"
"Easy. Once you get enough alcohol in you to loosen you up a bit, you're all set to jump. This time of day, the sunlight heats up the pavement and windows and creates a thermal between this building and the one across the street. So you just jump out, spread your arms and legs loosely, and ride down on a gentle breeze. It's awesome. You should try it."
"You know what? I think I will! Bartender, two tequilas!"
Drinking both tequilas, the man screams "KOWABUNGA!" and leaps out the window, falling forty stories to his messy death.
The bartender, polishing a mug, looks at the jumper with a frown.
"You know Superman, you're a real asshole when you're drunk."