BEDBUGS.
<Insert dramatic music here>
An adult bedbug, and a baby bedbug.
How can we avoid such rude and unappreciative guest? Well first, we need to identify what they look like. Don't start burning your house down after you think you saw a bedbug, it might have been Uncle Rick or Aunt Martha.
WARNING: After editing this post, and taking another look at the horrifying pictures I selected, I strongly suggest not finishing this article, I mean some of the pictures I found, were so horrible, and gave me such large goosebumps, that I myself will be unable to sleep comfortably tonight. If you think the picture below is a "little" terrifying, which isn't, you'll be horrified to the point in which you cannot describe your emotions without mentioning "horrifying" multiple times. Turn back while your eyes have yet to be scarred.
They don't even contribute to the rent!