A man walks into a bar and sees a sign that says, "Free beer for a year if you can make the horse at the end of the bar laugh."
So the man goes up to the horse and whispers something in its ear. Suddenly, the horse bursts out laughing uncontrollably. The bartender is amazed and gives the man a free beer.
The next day, the man comes back to the bar and sees a new sign that says, "Free food for a year if you can make the horse stop laughing."
So the man goes up to the horse again and whispers something else in its ear. The horse immediately stops laughing and looks at the man in shock. The bartender is even more amazed and gives the man free food for a year.
A week later, the man comes back to the bar and sees a third sign that says, "Free drinks for a year if you can make the horse cry."
The man goes up to the horse one more time and whispers something in its ear. This time, the horse starts sobbing uncontrollably. The bartender is in complete disbelief and asks the man how he can possibly do all these amazing things with the horse.
The man smirks and says, "Well, first I told him my penis was bigger than his. Then I told him I was sleeping with his wife. And finally, I told him we were out of beer."