so two guys are standing on a roof arguing about whose penis is bigger (yeah i know) so the inally decide to whip em out and see for themselves. Fist guy whips it out and suddenly looks over the edge, "Damn I think I hit the window washer!" He turns and sees his friend is dancing to and fro, "What the hell are you doing?"
"Dodging traffic!"
or
A guy walks in to the bathroom and up to the urinal and starts whizzing, h decides to be funny so he laughs softly, "Man the water in these things is so cold!'
The guy next to him nods and replies, "Yeah, don't mind that so much but all the bend in the pipe is a pain!"