On the surface the story behind Super Mario Bros. seems pretty normal- moustachioed plumbers raised by egg laying dinosaurs save princess from a giant mutated turtle with a Donkey Kong complex.
Mario and his brother squash mutant mushrooms, turtles, fish and other fairly normal looking animals, but things start to get strange in the Mushroom Kingdom every time they battle ghosts and other supernatural creatures.
It's like the game designers just gave up on realism and decided to get weird with it when they created creatures like Boo, I mean, who the heck is that body shape based on?
There's a simple and obvious explanation to all the strangeness that occurs in the Super Mario Bros. franchise, as shown here in this EXTRALIFE comic by Scott Johnson.
-Via Geeks Are Sexy