A man walks into a bar and sees a sign that reads, "Free drinks for the person who can make our horse laugh." Intrigued, the man asks the bartender about the challenge.
The bartender explains that the horse has never laughed before and they have been trying to get it to laugh for years. The man decides to give it a try and walks over to the horse.
He whispers something in the horse's ear and suddenly, the horse bursts out laughing uncontrollably. The man turns to the bartender and says, "I told him a joke about a donkey!"
The bartender is amazed and fulfills his promise of free drinks for the man. As the man enjoys his drinks, the bartender asks him how he managed to make the horse laugh.
The man replies, "Well, it's simple really. I just told the horse that I have a bigger carrot than he does!"