I used to think that apples that were both red & green were poisoned (thanks to a too-early exposure to Snow White & The Seven Dwarves). I still can't eat apples that are both red and green.
A childhood belief about dangerous food

others believed things like this
- i used to associate the word appetite with apples, if you ate apples, you had an appetite. — elly
- I was told that your belly button is where you put salt when you eat apples in bed.— Shurnuff
- Once my mother told me that if i ate 2 apples in a day, i would automatically get diahrreah!Anon
- I used to believe that if you ate the pips in apples a tree would grow inside your stomach.— QueenB
- i used to believe that if you swallowed the seeds from apples, trees would grow out of your ears!— Scott Davenport
- My dad always told me never to swallow the pips from apples because trees would start growing in my stomach!!— ALISON W