A man walks into a bar and sits down and orders a drink. He then notices a jar that is full of money. The man asks the bartender what the jar is for.

The bartender then says that he has a donkey in the back room and
"if anyone can make him him laugh they win the money. If not they owe me 100 dollars."

The man says,
"I can do it!" So he goes into the back room and about 5 minutes later the bartender hears the donkey laughing out loud. The man walks out and takes the money from the jar, thanks the bartender, and leaves.

About a month later the man comes back into the bar and there is a new jar of money. The man asks the bartender what the new jar of money is for.

The bartender looks at the man and says,
"if you can make the donkey cry the money is yours, if not you owe me 100 dollars"
The man says, "ok I’ll do it!"

He walks into the back room and about 2 minutes goes by when the bartender hears the donkey crying. The man walks out and grabs the money out of the jar, but before the man leaves the bartender asks,
"How did you make the donkey laugh?"

The man looks at the bartender and says,
"Well the first time I told the donkey that I had a bigger pecker then he did".

"How did you make him cry?" asks the bartender?
"Well I showed him."