We received a fairly confusing question from a reader about gray worms in the toilet. Actually, the gray worms (or grey worms if you prefer this spelling) were not in a toilet, but in a “potty,” which we are assuming is a trainer toilet of some variety or another for your children. The reader is hoping she found a “fly larva,” and that no one in the family has any sort of parasitic worm infection, and for this reason she wanted us to identify the gray worm in the toilet.