It all started when I was little, but I have an irrational fear of the lid being off the tank of the toilet. I won't go near it if the lid is off. I still don't know why exactly....
A childhood belief about fear of

others believed things like this
- I used to think that the TV show "Shark Tank" involved actual sharks in a tank.Anon
- My brother (who was 6 at the time) would never flush the toilet in fear of our new house being blown up! Anon
- i used to think when it started raining it was god flushing the toilet— edel
- I thought the lyrics to "Don't fear the reaper" were "Don't fear the reefer"— who new?
- My parents used to own a Restaurant. I belived the lobsters in the tank were pets.— Ned
- After seeing Thomas the Tank Engine, I believed that all the locomotives in the world had a face.— Joe