Sometimes in the CMB (Mostly Random) Jack Skellington will appear with a very Big head, he will freak out or get punched and have a big head. It's said in Return of the Ehhs Part 2 that Mario does not like people with big heads. Big Head Jack has (of course!) a big head but a small body with stubby legs and stubby arms. He has no appered in MarioMario8989's later videos, mabye because nobody liked this alter ego.