There's these two simpletons who were driving down HWY 101. The simpleton driving said to the passenger "Duh, check and see if my turn signal's working." The passenger said "Duh, ok." And he rolled down the window and stuck his head out. He looked and he said "Duh, yeah it's working. No, it's not. Yeah, it is. No, it's not. Yeah, it is. No, it's not...."