A man walks into a bar and sees a sign that says, "Free drinks to anyone who can make our horse laugh." Intrigued, the man asks the bartender about the challenge.
The bartender explains that they have a horse out back who is always down in the dumps and they've tried everything to cheer him up. The man accepts the challenge and goes out back to the horse.
He whispers something in the horse's ear and within seconds, the horse is rolling on the ground laughing hysterically. The bartender is amazed and asks the man what he said to the horse.
The man replies, "I told him I was a famous comedian and that I would be performing here tonight."