A reader wrote to us recently about a “scary looking really fast moving worm on my bathroom floor.” Emphasizing its speed once more, the reader reports that the worm, which is actually most likely a centipede (more on this in a second), “moved really fast even on a wet floor,” and also mentioned that it crawled up into the wall after it was spotted. The reader was quite startled by the worm (or centipede), and asked for our help. Obviously, we aren’t in position to help in any sort of direct way, but we can help with the matter of identification, and again we think our reader found a centipede, not a worm, for reasons we will now outline.