A man walks into a bar and sees a sign that says, "If you can make the horse at the end of the bar laugh, you win $100." Intrigued, the man goes up to the horse and whispers something in its ear. The horse immediately starts laughing uncontrollably, rolling on the ground and snorting with glee. The bartender, amazed, hands the man $100.
A week later, the man comes back to the bar and sees a new sign that says, "If you can make the horse cry, you win $200." Determined to win more money, the man goes up to the horse and whispers something else in its ear. This time, the horse breaks down in tears, sobbing and wiping its eyes with its hooves. The bartender, once again amazed, hands the man $200.
Intrigued by the man's talent, the bartender asks him what he said to the horse to make it laugh and then cry. The man replies, "Well, the first time I told him my penis was bigger than his. The second time, I showed him."