The best biker comedian ever is Ed Hertfelder. I know it's dirt-bike humor but 'The Duct Tapes' are the funniest things I ever heard. These are from the classic, "Did you ever ride an enduro?
Did you ever try to let a pound of air out of a tire and have the valve stick open?
Did you ever borrow a tool with your name already on it?
Did you ever loan a guy a tool with HIS name already on it?
Did you ever compete on eighteen inches of snow flurries?
Did you ever tighten a single loose spoke and loosen all the others?
Did you ever lean a bike on a dead tree and have the tree fall over?
Did you ever make a side cover gasket from the bottom of a pizza box?
Did you ever promise your heating pad that you'd never ride again?