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Todd's Worms are the antagonists in the Goosebumps book Go Eat Worms!  Todd is an enthusiastic worm collector, but after cutting a worm in half for an experiment, his worms seem to be watching him angrily.  Suddenly, worms start appearing everywhere - in his food, in his bed, and in his homework. At the end of the book, a giant worm, presumably the mother of the rest of them, shows up and attempts to drag Todd underground.  He is saved when his sister shows up holding a giant paper machine robin, scaring the worm away. After this, Todd gives up his worm hobby for good.