A man walks into a bar.

He orders a drink and after a few minutes sees a jar full of cash sitting behind the bar. Curious, he asks the bartender about it.

"Well, you can win that money. You see, we have a mule out back that is rather depressed. If you can make him laugh you win the money. But first you have to put twenty dollars in the pot."

The patron considers the challenge for a bit then hands the bartender a twenty and walks to the back door. All the patrons watch him leave in silence.

After about a minute they hear the mule start braying and laughing for all he is worth. The patron returns to the bar and claims his winnings.

Awestruck, the bartender asks how he managed to do that so fast.

"Well, quite frankly I'm pretty sure I could get that mule to do just about anything."

Says the bartender "Well, I"ll tell you what, I'll double your winnings if you can make him cry."

The man agrees and walks out the door again, with everyone waiting in anticipation. About a minute passes and the mule begins crying even more hysterically than he was laughing before.

The man returns inside and claims his reward. Dumbstruck the bartender asked him how he did it.

"Well, the first time I went out there I told him my dick was larger than his. The second time I proved it."