For some reason I got the idea that a lobster lived in the toilet and would pinch my butt with its sharp giant claws. I was afraid to sit on the toilet and would try to be as fast as I could when going to the bathroom. I must have been about 6 or 7 at this time.
The really strange thing is that I had very little exposure to seafood growing up, so I have no idea where this belief came from. I see I'm not the only one who thought something scary lived down there, though...
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
- I used to be afraid that "boney Legs", a witch from a story Lived in the toilet. Anon
- i used to be scared to use the bathroom becuase i believed something lived in the toilet.— robert allen freeman the fourth
- 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 there were lobsters in the toilet and if I didn't look they would come up and pinch me.— Traumatized
- When I was 8 I thought a spider lived in the toilet and would bite me if I sat on it.— Mike