I used to watch rugrats when i was a little kid, and there was an episode where a watermelon grew inside of Chuckie's stomach. Because of that, I was always afraid to eat a watermelon because i thought if i swallowed a seed, that would happen to me. I thought it was true until i was about 8.
A childhood belief about watermelons

others believed things like this
- I use to believe (thanks to my Mom) that if I swallowed a watermelon seed a watermelon would grow in my belly.Anon
- I used to believe that if you ate a watermelon seed you would grow a watermelon tree in your stomach!!!— Eskimo
- 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
- I used to believe that if you swallowed watermelon seeds, they would dance around in your stomach at night.— jaalyn
- when you eat the seeds from a watermelon a watermelon will start to grow inside your stomache.Anon