my mom used to tell me not to eat watermelon seeds or there would be a tree growing inside me. i believed her and didn't eat/swallow the seeds. it's a myth and i eat/swallow them all the time, now.
A childhood belief about seeds

others believed things like this
- when you eat the seeds from a watermelon a watermelon will start to grow inside your stomache.Anon
- If you eat watermelon seeds a watermelon will grow in your tummy and vines will come out your earsAnon
- In primary school, a whole bunch of kids including me believed that watermelon seeds contained ants. — Caff
- I used to believe that if I swallowed watermelon seeds, I would get pregnantAnon
- I used to think that if i ate watermelon seeds they would grow out of my ears.— Catherine
- I used to think that watermelon seeds were dead soulsAnon