He is played by Jon Heder who is also famous for Napoleon Dynamite.
Clark is a clumsy paperboy (who constantly ends up throwing his newspapers on the neighbors' rooves). He's also rather dimwitted and gross (he picks his nose, and eats bugs). He is also very clumsy with baseball. He hits the ball, but then tosses the baseball bat far away, resulting in some broken things. He also doesn't release a hot potato until it's too much for him and flags it out the window.