When I was younger, I believed that every time I flushed the toilet, dinosaurs would come out of the wall and eat me. It never happened of course, but the possibility freaked me out nevertheless.
A childhood belief about fear of

others believed things like this
- I believed you had to color all the dinosaurs in coloring books green because all the dinosaurs WERE green.— Betty
- I believed everytime the toilet flushed a wave broke on a beach— Jenelle
- 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 i could go back in time so i could see dinosaurs.Anon