34. Major Burrows

GAME: Super Mario Galaxy (Wii, 2007)
If you came to us when we were kids and told us that one day we'd have nightmares about an unstoppable giant beaver, we'd probably assume it had something to do with the questionably accurate anatomical drawings Tommy Flanagan was always showing us in health class. Of course, now we know that it's just a stupid stupid boss with a stupid stupid weakness that requires perfect timing to kill. NOTE: Yes, we know he's a mole. But it's way funnier if he's a beaver.