Two guys are wasted on the rooftop bar of a skyscraper.....

..and the bartender steps out for a minute.

First drunk guy: I'll let you in on a lil secret- there's an up draft of air current so strong on the north side of this skyscraper that you can float in mid air right off the edge of the roof.

Second drunk guy: I might be shit faced but I'm not stupid.

First drunk guy: Ok - watch this.

First drunk guy proceeds to step off the edge of the roof and walk a few feet away from the roof's edge and clearly floats in the air.

Second drunk guy : WTF?!?!??! How'd you do that???

First drunk guy : I told you - the up draft is THAT strong.

Second drunk guy : THAT CAN'T BE!!

So the first drunk guy proceeds to walk in the air to the the left then a little to the right.

Second drunk guy : DAMM!!!! ------ Let me try it!

Second drunk guy proceeds to step off the edge of the roof at the same point as the first drunk guy and falls straight down - hits the pavement below and dies.

Just then bartender returns and takes a look down at the commotion on the street below and turns to the first drunk guy.....

Bartender : Superman - you know you're a real dick when you're drunk.