Two guys are sitting in a luxorious penthouse bar at the top of a skyscraper, getting wasted.
One of the guys is good-looking, really big and muscular with jet black hair and glasses. The other guy is a tiny little runt who can only just see over the bar. He's also got glasses, although he's so near-sighted he needs contacts just to be able to see through them.
The two guys are sitting in the bar, steadily getting drunker and drunker.
Finally, when they're very, very drunk, the big guy turns towards the little guy and says:
"Hey, you know what? We're really high up in the air here. The windsheer on altitudes this great is kinda funny. I'll bet you anything that if I went over to the window and jumped out of it, I wouldn't fall to my death and go 'splat' on the pavement. I'd slowly fall out of the window, make a little loop in mid-air and then sloooowly fall back in again, unharmed."
"Bullshit", says the little guy, struggling to focus on the big guy. "I'll believe that when I see it!"
So the big guy goes over to the window and opens it. He leaps out of the window, but doesn't fall to his death and go 'splat' on the pavement. Instead, he slowly falls out of the window, makes a little loop in mid-air and then sloooowly falls back in again, unharmed. He closes the window back up and flashes a triumphant grin at the little guy.
"Well I'll be a sonofabitch", the little guy says. "I gotta try that myself!"
So the little guy also goes over to the window and opens it. He leaps out of the window and immediately falls to his death and goes 'splat' on the pavement.
The big guy watches him go while chuckling to himself. Then he closes the window back up, smiles, and goes back to the bar to get another drink.
The bartender brings his drink over, and then leans over the bar and stares angrily at the big guy.
"You sure turn into one mean guy when you're drunk, Superman."