when I was young my mom would tell me that if you eat a seed from like a watermelon or something, a plant will grow out of the top of your head.
A childhood belief about watermelons

others believed things like this
- I used to believe that if you ate a watermelon seed you would grow a watermelon tree in your stomach!!!— Eskimo
- I use to believe (thanks to my Mom) that if I swallowed a watermelon seed a watermelon would grow in my belly.Anon
- if you eat a seed, the plant will grow in your tummyAnon
- If you swallowed a watermelon seed it would grow in your belly— Rachelle
- I used to beleive that if you ate a black watermelon seed a tree would grow in your stomach— anonymous
- If you eat watermelon seeds a watermelon will grow in your tummy and vines will come out your earsAnon