A man walks into a bar and has a drink. As he looks around he notices a mule standing in the corner crying his eyes out. On the table beside the mule is a bucket full of ten dollar bills. The man asks the bartender what the mule is doing there.

The bartender replies that anyone who wants can put ten dollars into the bucket and try to make the mule laugh, if they succeed then they get all the money. The man walks over and drops his money in the bucket and whispers into the mule ear for a minute.

Suddednly the mule bursts out laughing. The man picks up the bucket of money and walks out. About a year later he returns to the same bar. The mule is standing in the corner laughing his eyes out. Once again there is a buycket of money in froont of him. This time the goal is to make the mule cry. Once again the man goes to the mule and pays. They huddle together in the corner for a minute and suddenly the mule bursts into tears.

The man picks up the money and starts to leave. The bartender stops hiom and asks what the secret was.

"The first time I was here I told the mule I had a bigger d**k than he did. This time I proved it."