This is terrible...
When I was younger(maybe five-ish) I had heard that Elvis Presley had died on a toilet, so I always thought that if you flushed the toilet, his ghost would come out and get you. I didn't flush the toilet for 2 or 3 years...
I also thought that you got pregnant from kissing.
A childhood belief about fear of

others believed things like this
- I used to beleve when i was 4 that the flush on the toilet was to wake up toilet monsters.— Millie
- 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
- I used to think if I left the toilet seat open my cat would get flushed down the toilet.— G
- I used to believe that Limabeans would kill you if you didn't eat them.
I flushed them down the toilet.— Lima - I thought that toilet paper was bread and by puting it it the toilet i was feeding the ducks at the bottem.— Gringo