I used to believe that rats would come out of the toilet when it was flushed late at night so i would run back to my bedroom quickly and rush getting back into bed.
A childhood belief about fear of

others believed things like this
- Oasis - Don't Look Back In Anger
"Oh, Harry can't mate
He knows it's too late
As he's stalking, oh my..."— Santa Puncher - 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 the water in the ocean went away a night......then came back in the morning.— Beverly
- I used to believe that the toilet would suck me down if I flushed it.— :-)