A dirty joke

A man is peeing in a public restroom when a very short man with a long bushy beard walks in and begins peeing next to him. Now the man doesn't mean to look but he can't help but notice that the short man has a gigantic penis. It is so large that he can't look away. The short man notices the man looking and says, " I am a leprechaun and we all have units this size". The man blushes and says, "I apologize for staring sir, I just wish my cock was that size." "well," says the leprechaun," It just so happens I can grant wishes. If you let me have my way with you in the stall I will give you a wang this size." The man thinks about it for a minute and decides he must have an organ that size so he says he'll do it. After the two have been going at it for a while the man exclaims," I can believe how big my wiener is going to be." And the short man from behind replies," I can't believe you believed I was a leprechaun!"