If there's one thing we hate in this world, it's bugs invading our private space. Seriously, we need to reach some kind of agreement with the bug leadership so that they stay out of our territory. But, until that happens, you may want to stack up on stockings. Wrapping the bathroom drain with a stocking will help keep any curious bugs from going where they shouldn't be.
If bugs ever crawl into your home through the drain, this trick should do it. Drains are an effective infiltration strategy bugs have at their disposal, and this stocking trick counters it.