After I read the 2nd Harry Potter book, I was convinced that if I flushed the toilet, a basalisk would jump out.
A childhood belief about fear of

others believed things like this
- i used to believe Harry Potter was real— charlotte
- 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 if you read a book in the dark, you would go blind.— Ellen
- I read in a book that if you ever swallowed toothbrush bristles then you would get appendicitus!— Amy