I was 7 and was staying with my aunt in the country. She grew some vegetables there - cucumbers, pea. Once my uncle brought a watermelon from the market and put it among the cucumbers in the garden. I woke up in the morning and was really surprised to discover that a watermelon had grown in our garden overnight. but lol, I used to believe that up to the age of 12 or so, until my mother put me straight.
A childhood belief about watermelons

others believed things like this
- I used to believe that pickles grew on trees and didn't come from cucumbers.Anon
- that the green bit of cucumbers was poisonousAnon
- If you eat watermelon seeds a watermelon will grow in your tummy and vines will come out your earsAnon
- when you eat the seeds from a watermelon a watermelon will start to grow inside your stomache.Anon
- so guess what i learned the other day: pickles came from cucumbers. yes indeed.— jenna
- I used to believe that if you ate a watermelon seed you would grow a watermelon tree in your stomach!!!— Eskimo