A large invisible spider may be living in your head right now. And this is not a metaphor. Of course, you might consider my words paranoia. But remember, such thoughts are the first symptom of a parasitic infection. The creature inside you specifically stimulates skepticism so that you do not run to the doctor. However, the cure for such a disease tastes like a chainsaw, so the spider does everything right. You can't feel it as it controls your nerve endings. You will not feel anything even when the spider begins to reproduce.