So a guy walks into a bar, and sees a giant pile of cash on the bar counter. He ask the bartender about, who replies: "You can win that cash."
So they guy asks what he has to do, and the bartender says, "Well - there is a horse in that room over there - if you can make him laugh, you can win the money."
The guy agrees, and goes into the room with the horse. When he comes out, the horse is laughing its ass off, and can't stop. The bartender, impressed, gives the man the money.
The next day, the man goes back to the bar, and sees new pile of money. He asks the bartender if he can win it again. The bartender responds, "Sure. Just go into that room and make the horse cry."
The man agrees, and enters the room with the horse. When he comes out, the horse is in tears. He collects his money.
Then the bartender ask him, "How did you make that horse laugh, and then cry like a baby?"
The man says, "Well, it was simple. The first time, I told him my dick was bigger than his. The second time, I showed him!"
And some extra lolz: