Three drunkards are standing on top of the Empire State Building.
The first one says to the other two, "You know, it's a funny thing about these wind currents. A person could jump off of this building right now and not even hit the ground; the wind would carry him right back up to the top of the building!"
The second drunk says, "You're crazy!" The first drunk says, "I'm serious! Watch!" The first drunk jumps off of the building, and the wind carries him right back up to the top! The second drunk says, "Let me try!" So the second drunk leaps off of the building and promptly falls to the street below, landing with a hideous SPLAT! The first drunk smiles, clearly amused.
The third drunk looks at him and says, "You know, Superman, you can be a real jerk When you're drunk!"