A man walked into a bar, sat down at the far end and had a drink.
He noticed there was a horse in the back of the barroom with a big
pot of money on the floor in front of it.

"What's up with that?" He asked the bartender, pointing at the horse.

"You gotta put a dollar in the pot," explained the bartender,"if you can
make the horse laugh, you collect the pot."

The man walked over to the horse, dropped a dollar into the pot, and
whispered into it's ear. The horse cracked up, fell over, and rolled on
the floor in laughter. So the man picked up the pot and walked out.

Five years later the same man came into the bar, and saw the same
 horse, with another big pot of money in front of it. The bartender
recognized the man and noticed him looking at the horse in anticipation.
"It's not so easy now...this time you gotta make him cry." he said.

The man walked over to the horse and whispered in its ear, and from
behind, in the shadows, appeared to pull something out of his pocket
and showed the horse. The horse fell to its knees sobbing as though
its heart was breaking. The man picked up the pot and was walking
out the door when the bartender stopped him.

"Hey! At least you can tell us what you told him!"

"Easy," said the man. "The last time, I told him my penis is bigger than his.
This time I showed him."