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The Flying Spaghetti Monster is a giant, sentient entity made out of spaghetti and meatballs. At least two have appeared in SMG4's videos.
The second was created by Mario in The Spaghettipocalypse, where he mistakenly use a sort of magic stuff to put on his spaghetti. However, the monster has been eaten by Mario himself after Luigi gave him a star during Flying Cupcake Monster versus the Flying Spaghetti Monster.