I used to believe that the handles of toothbrushes were made out of hippo teeth. I know this originated in Kindergarten, but I don't know how.
A childhood belief about bathrooms

others believed things like this
- When was 5-6 I used to think that leather was made from hippo skin.— Richard Davies
- i used to think the toilet was a hippo and you fed it by poopin ofr peeing— russ
- I used to belive kissing boys made your teeth fall out.Anon
- I used to think that pickles were made out of frog skin and corn was old peoples teeth.— mandy
- I used to believe that eating burnt toast would make your teeth whiter and would brush your teeth for you.— Natasha
- I used to believe that if I didn't brush my teeth at night, ants would crawl into my mouth and eat my teeth.Anon