I am still trying to figure out American Football. Being Italian, I only know "futbol" and am a fan of Juventus.
Now, if you were to draw an analogy between the American sport and a tank to explain the game to someone, how would you do it? I can map basketball to shrimp playing with snails, but have no idea how a tank would be the field and the rules of the sport would map to critter behaviour (except for shrimp having a knack for piling on top of each other).