Pat the Irishman is sitting in a pub having a beer. A wee green fellow comes in the door, jumps up on the bar, does a couple of cartwheels to where Pat is sitting, stickS his face down in Pat's beer, goes "B-B-B-B-B-B-B-B", jumps up and scoots for the door. Just before he can get out, Pat catches up with him and grabs him by the neck. "You little @#&*#", says Pat; "I'm going to pull down your little green pants, grab you by your little green weenie, swing you around my head, and hurl you against the wall". "No yer not", says the little guy; "'cause I'm a leprachaun, and we don't have weenies".
"No weenies?" says Pat; "Then how do you pee?"

"We put our head down and go "B-B-B-B-B-B-B-B"