A man walks into a bar and sees a sign that says, "Free drinks for the person who can make our horse laugh." The man thinks this is a strange but interesting challenge, so he decides to give it a try.
He walks over to the horse and whispers something in its ear. Suddenly, the horse starts laughing hysterically, rolling on the ground and neighing with delight. The bartender is amazed and gives the man his free drink.
The next week, the man returns to the bar and sees a new sign that says, "Free drinks for the person who can make our horse cry." Intrigued once again, the man approaches the horse and whispers something in its ear. This time, the horse starts sobbing uncontrollably, tears streaming down its cheeks.
The bartender is stunned and asks the man how he managed to make the horse laugh and then cry. The man replies, "Well, last week I told him my paycheck was bigger than his, and this week I told him I lied."