2. Descended from rugby, the first football was actually played on a massive 400×250-foot field with massive teams—25 players to a side. The ball was round and, originally, made from a pig’s bladder, hence the term “pigskin.” But, as you might imagine, what blowing up a pig’s bladder lacks in fun, it more than makes up for in being totally gross. Besides, the balls were notorious for not holding their shape. Enter the cow.