I used to believe that there was an evil clown who lived in the toilets and came up and bit you if you sat on the toilet after you flushed.
A childhood belief about fear of

others believed things like this
- 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 think that a clown lived under my bed and tried to eat me while i was asleepAnon
- 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 little people lived in the toilets. and that they could eat anything and everything. — bob the pinecreek
- I believed alligators lived in toilets, and one apparently got hold of my sister.Anon