A guy is sitting at a bar in the Penthouse on the 30th floor of a fancy hotel.  A woman walks up to him and says, "Hey, sailor, what cha drinking?"

"Oh, nothing," the guy replies, "Except for this... magic beer!"

"What?" the girl says, incredulous.  "No way!"

"Yes," the guy says, "I'm dead serious.  This beer is MAGIC.  What this." 

The guy downs the rest of his beer, runs over to a nearby window, opens it, jumps out and starts FLYING around.  After about a minute, he comes back in.

"WOW!" says the girl, "That's amazing!  I want to try some of that!"

"Barkeep!" says the man, "Give the lady one of what I'm having."

The barkeep comes over and gives the lady a beer.  She promptly downs it, runs over to the windows,  yells, "Watch me!" and jumps out.

She then promptly falls into the ground below.

The barkeeper sighs heavily and says, "You know, Superman, you're a real ASSHOLE when you're drunk!"