this belief isn't mine but my older sisters, i don't think she would mind it if i shared as long as she's anonymous,
until she was about 16 she believed that my best friend has a cow's heart because of a joke her mother made when we were little kids.
A childhood belief about general

others believed things like this
- My friend's sister believed the lyrics to Gazza's "Fog on the Tyne" were "Fog on the dinasaurs mine all mine"— Suzanne
- I once told a friend of mine that if you held in a smelly burp, it'd turn into a fart. She believed me.Anon
- My cousic used to think he was older than me because his birthday was in June and mine was in December.— //**...Ethan...**\\
- I believed that linguini was made of tape worms and was scared to eat pasta for a long time!— Mojo!
- a friend of my little sister's had 4 older brothers, so she thought that when you got older you grew a penis!Anon
- A friend of mine seemed to think that 100 pence was worth £6.— Richard Davies