A man was sitting in a bar which happened to be located on the top of a skyscraper. A big fella walked in and said:
'bartender, give me a Jack Daniels.'

Then he downed the Jack and jumped out the window. The man sitting at the bar was stunned, as the big guy floated back in and sat down. The man at the bar was amazed and said:
'mister, how in the world did you do that?'

The man said, 'Its simple, there are a lot of wind currents up here and they sweep you right back in after you jump.'

The man at the bar said, 'Well, can I try?'

'Sure.'

So the man ran and jumped out the window and fell to his death making a terrible racket. The bartender looked at the man and said:
'Superman, you can be a real jerk when you're drunk!'