My grandpa has a really big stomach, and when i was little he told me and my sister that if you swallowed watermelon seeds that one would grow in your tummy. Then he'd say that it's too big to be pooped out and it would stay in there for the rest of your life. After that, he used to pretend to swallow the seeds (but we believed him) and that's why we thought his stomach was so big.
A childhood belief about watermelons

others believed things like this
- I used to believe that if you swallowed watermelon seeds, they would dance around in your stomach at night.— jaalyn
- If you eat watermelon seeds a watermelon will grow in your tummy and vines will come out your earsAnon
- I used to believe that if I ate a fruit's seeds, a plant would grow in my stomach.— Natalia Castillejo
- I used to believe that if I ate any seeds of any fruit, it would grow a tree in my stomach.— Julia
- I used to think that if you ate nuts and seeds that minature trees woudl grow in your stomach.— Gillian
- I used to believe that if I swallowed watermelon seeds, I would get pregnantAnon