A man walks up to a bar and says to the barman, "You see that glass at the far end of the bar? I'll bet you $100 I can piss into it from here."
The barman figures this will be the easiest hundred bucks he ever made and says, "You're on!"
So the man whips it out, takes aim, and completely fails to get a single drop anywhere near the glass. He then happily pays up.
As the barman pockets his winnings, he says, "You didn't even come close. Why would you make such a stupid bet?"
The man replies, "Well, you see that guy over in the corner, banging his head on the table? I just bet him $1,000 that you'd let me piss all over your bar!"
And that, my friends, is the story of Goldman Sachs.