When my sister was younger, we lived with our grandparents. Everytime my sister went to sit on the toilet, she was convinced that our grandfather - in blue, agitated, and sperm-like form - was swimming in the toilet, ready to bite her on the bum.
A childhood belief about fear of

others believed things like this
- I used to believe that crocodiles lived in the toilet and would bite my butt when I had to go to the loo.— Oz
- When I was 8 I thought a spider lived in the toilet and would bite me if I sat on it.— Mike
- I used to believe that monsters lived in my toilet and they ate my poop and urine when i flushed the toilet.Anon
- My younger sister used to believe that in everybody's belly button there lived a family of squirrels.— Sophie
- I used to believe that if I sat on the toilet too long a snake would come up and bite me.— Cheesemonkey
- i used to think that when i was pooping a crocodile could come out of the toilet and bite my butt off.— derek