A man walks into a bar and sees a sign that says, "If you can make our horse laugh, you get a free drink." Intrigued, the man asks the bartender about the challenge.
The bartender explains that the horse has always been a bit gloomy and no one has ever been able to make it laugh. The man decides to give it a try and approaches 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 think I deserve that free drink now."
The bartender, in disbelief, asks the man what he said to the horse to make it laugh. The man grins and says, "I told him I was the one who installed the automatic sliding doors in the barn."