As much as I enjoyed seeing entire families (the size that would put a mormon to shame here) on a motorcycle while I was in Africa, the best I ever saw was a full grown bull, strapped to a board across the back of a 150cc Chinese made motorcycle (still alive and mooing at the top of its lungs) on his way to the market - going through a crowded market street (dirt road packed with pedestrians) at around 25mph. Horn was blaring, cow was moving, driver was yelling and people parted like the red sea.
EDIT: Forgot to mention - the bull wasn't wearing gloves or a helmet. How careless.