After seeing JAWS the film on TV when I was very young I was scared of visiting the toilet.
There is a young woman who gets killed at the start and I believed I'd see her arm in the toilet bowl.
A childhood belief about fear of

others believed things like this
- I used to believe that toilet seats were for kids only and that adults sat directly on the bowl. — Evan Klyne
- i used to be scared to use the bathroom becuase i believed something lived in the toilet.— robert allen freeman the fourth
- If i was drinking out of the toilet, i could have been killed!— Slinx
- I was scared that if I peed too much, the toilet would flood— scarlett
- When I was really young I used to think that dead bodies wouldn't start rotting until they were buried.— Katherine
- I thought that toilet paper was bread and by puting it it the toilet i was feeding the ducks at the bottem.— Gringo