Makes me to laugh

My youngest came home with this joke last night, and it never fails to make me laugh when I think about it.

Two men were sitting at a bar, drinking. The bartender washed dishes behind the bar and watched them. The first man drank a shot, jumped out the window, and came back in another window. Then he sat back down.

The second man asked, "How did you do that?"

The first man shrugged. Then, he drank another shot, jumped out the window again, and again returned through another window.

The second man drank a shot and jumped out the window, plunging to his death 50 feet below.

The bartender said to the first man: "You're mean when you're drunk, Superman."