Yeah when I was 8 years old I believed the kids in my class had installed a closed circuit security system in my bathroom at home. I believed they had a secret clubhouse and would gather there to watch me go to the bathroom and make fun of me. Like, I had huge anxiety for years, probably into my early teens, about the "cameras" in my bathroom (which obviously didn't exist.) Of course you tell people this, and they just say "oh little kids have good imaginations." So, sure, whatever. I just know I really believed it and that's the first thing I can really pinpoint in this area.