i used to believe that if you sat on the toilet in a storm the lightning could come up through the pipes and get you. I thought that it was the same as when adults would say don't talk on the phone in a storm. Apparently not.
But i remember being terrified to use the toilet during a storm.
A childhood belief about fear of

others believed things like this
- When I was a child, I used to believe that when there was a storm it was because God was angry.— Raul
- When I was younger, I believed that squinting in a storm would make you cross-eyed... forever.Anon
- I used to believe that toilet seats were for kids only and that adults sat directly on the bowl. — Evan Klyne
- I thought that toilet paper was bread and by puting it it the toilet i was feeding the ducks at the bottem.— Gringo
- I used to believe that monsters lived in my toilet and they ate my poop and urine when i flushed the toilet.Anon
- I used to believe that if I flushed the toilet before I showered, I would take a shower in dirty toilet water.— Chris D