A man walks into a bar and sees a sign that reads, "If you can make the horse at the end of the bar laugh, you win a free drink." Intrigued, the man walks over to the horse and whispers something in its ear. The horse starts laughing hysterically, rolling on the floor and snorting uncontrollably.
The bartender is amazed and asks the man how he did it. The man shrugs and says, "I just told him a joke."
The bartender, curious now, asks the man to tell him the joke. The man grins and says, "Well, it's kind of a long one. So, there's a man who 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 a free drink…'"