When I was eating any fruit, I was told by my parents I should never swallow the seeds or a tree would grow inside me and the branches would come out of my ears.
Then I found out that the appendix might get blocked by ingesting seeds and other hard to digest things.
A childhood belief about seeds

you weren't the only one
237 of you believed this
- i used to believe that if you swallowed the seeds from apples, trees would grow out of your ears!— Scott Davenport
- if you eat a seed, the plant will grow in your tummyAnon
- When I was little I use to belief that if we swallowed the pit of a fruit, a tree would grow inside us.— Maya
- when you eat the seeds from a watermelon a watermelon will start to grow inside your stomache.Anon
- 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 you ate the pips in apples a tree would grow inside your stomach.— QueenB