I used to believe that fruits were actually a hybrid of the flower of the fruit tree and of the bees/wasps that pollinated them.
I believed this because I asked my dad, an avid gardener, how grapefruit grew on our tree. Right when I asked, a bee landed inside one of the flowers. My dad pointed out the bee and told me that the bee enters the flower, which causes the grapefruit to grow, but he left out the part about the bee leaving the flower. So being an imaginative 7-year old, I concluded that because the bee never left, that must mean that it became the fruit.
For years, before I bit into any fruit, I would say a little prayer for the bees that gave up their lives to become those yummy apples, pears, and oranges that I so enjoyed.
A childhood belief about plants

others believed things like this
- I used to believe if you ate a seed from a fruit, a tree of that fruit would grow inside you — kels
- I used to believe that a tree would grow inside you if you ate the seed of an apple or any other fruit!Anon
- When I was little I use to belief that if we swallowed the pit of a fruit, a tree would grow inside us.— Maya
- 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 falsely believe that planting a fruit pip in the garden would actually grow a tree or bush.— Natasha
- My sister thought a fruit machine (the gaming device) could turn one item of fruit into another.— Richard Davies