Short version
man has small penis and no confidence
man walks into a bathroom and sees a midget in a "leprachan" suit and laughs
leprachan has huge weiner
man frowns
leprachan man says whats wrong
man says he has a small weiner
leprachan man says, i'm really a leprachan and i can make you have a big penis
man says how
leprachan says i have to fuck you in the ass
man says okay make it quick
Leprachan asks whats your name ::Pounds him:: (JOHN OUCH)
Leprachan asks where you from ::Pounds him:: (Atlanta OUCH)
leprachan asks how old you are ::Pounds him and finishes:: (36 OUCH)

Leprachan says, well john, aren't you a bit old to believe in leprachans...

punchline..
man got ass raped willingly