Yet another bar joke...
 

A guy is sitting at a bar drinking. Another guy walks up to him, and says,

"You know, this building has this really strange current up on the top floor. There's a door there, and you can step outside it and just float there, you don't fall. I'll bet you $10 I can just float outside that door."

The first guy thinks to himself, "That's pretty amazing, for only $10, I have to see this. I think it's worth it." So he tells the other guy, "Sure!"

They go up to the top floor, and sure enough, the challenger can indeed step outside the door and just float. He steps back in, and collects his $10.

The first guy says, "Wow! That was amazing! Can anyone do that?"

The second guy says, "Yeah, there's nothing to it, give it a try!"

The first guy opens the door, steps out, and falls to his death.

The second guy goes back downstairs, and the bartender says, "Jesus, Superman, you can be a real asshole when you're drunk!"

This is exactly the kind of crap I would do if I were Superman.
Fuck sacrificing myself for the greater good.