I used to think that when i flushed the toilet a monster would come out of the pipes and grab me so after i flushed the toilet i would run like hell out of the bathroom ,convinced that the monster would get me if i didn't.
A childhood belief about fear of

others believed things like this
- I used to believe that everything you flushed down the toilet ended up in "Hell".— Abi
- 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 believe that Limabeans would kill you if you didn't eat them.
I flushed them down the toilet.— Lima - 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 the toilet would suck me down if I flushed it.— :-)