It's amazing the sort of crazy nonsense you'll totally accept at face value when you're a little kid. Playing Super Mario Bros. when I was eight, I did not flinch at the game's fever-dream logic concerning ambulatory mushrooms or flowers that make you shoot fireballs. This was simply how things worked in the Mushroom Kingdom.
Kotaku reader and Carnegie Mellon student Theyab has taken this line of thinking to its logical conclusion with The Science of the Mushroom Kingdom, which is basically a textbook that treats all of the bizarre rules of the Mushroom Kingdom as though they applied to our world, and explains them in simple, pseudo-scientific terms. It's pretty convincing as a textbook--I particularly like that it's published by McToad-Hill--and it somehow makes the already-crazy Mushroom Kingdom seem even crazier.