A man walks into a bar on the top floor of a skyscraper.
He notices a guy sitting by the window, gulping down a pint. Suddenly, the guy jumps up and leaps out of the window!
The man sits there in shock and confusion. But to his great surprise, after a minute, the guy calmly flies back through the window unharmed and asks for another pint.
“Hey, how did you do that???” He asks in amazement.
“Simple.” explains the guy. “This beer is magic. Each pint gives you the power of flight for exactly 5 minutes.”
The man orders a pint, gulps it down, and rushes to the window. He leaps out, and plummets down the ground, dying instantly.
The bartender sighs. “You know, you’re a real jerk when you’re drunk, superman.”