A man walks into a bar and sees a giant jar of money on the counter.

He asks the bartender, "Hey barkeep. What's up with the jar of money?" The bartender replies, "Well you see, I've got this horse in the back. And ever since I bought it the damn thing has been so depressed I can't get it to do anything! It won't eat, it won't sleep, I'm clueless! The jar of money is for whoever can cheer up the damn horse!" The man says, "gimme a try." He walks back into the stable and within seconds he returns. The bartender checks on the horse and it can't stop laughing! It's neighing and bouncing around and completely cheered up. The bartender says "Alright man, you earned it. The jar is yours."

A week later the same man returns to find another jar of money. He asks, "What's up barkeep? Is your horse down in the dumps again?" The bartender looks up and replies rather aggressively, "No, actually ever since you left I can't get the damn thing to shut up! I can't sleep at night, it's driving me mad! This time the jar is for whoever can shut it the hell up!" The man says "let me give it another go" and heads to the back. Just like last time, he returns seconds later. The bartender checks on the horse and it's just standing there silently. Completely stoic. Not making any indications it's even alive. The man says, "Alright bub, I'll give you the money, but you have to tell me just how you did it." The man laughingly replies, "Well. To get the horse to start laughing I told it I have a bigger dick than he does. To get the horse to stop laughing... I proved it."