I know...
Bees make honey and
flies make peanut butter!
(my son at age 3, noticing a fly which had landed on a gob of peanut butter on the counter)
A childhood belief about general

others believed things like this
- I thought that barf was what they used to make peanut butter and jelly sandwiches!— Maan o' War
- I used to believe that peanut butter was lobster poo.— PaulH(nz)
- My daughter thought that ear wax was peanut butter.— Bobbiemac
- When I was a little boy, I thought that hair was made out of peanut butter.Anon
- i used to believe that the chunks in chunky peanut butter were bugs.— Lauren
- I used to believe that my mother invented peanut butter and jelly sandwiches. Anon