competition: best joke you heard from a friend

one day i was at the bar, the bartender said there`s a contest. whoever wins get 50 dollars worth of beer. the contest was making a donkey laugh and cry. so i gave it a shot. once i won the contest. the bartender told me how did i make the donkey laugh and cry. first i made the donkey laugh by telling him that my penis was bigger than his. i made him cry because i showed it to him.....