When my little brother was about 3, he asked my mother and myself for "pee buh buh" over and over. He even went as far as to put both of his hands to my mom's cheeks and slowly mouth the words. We kept asking him if he meant peanut butter. After about 10 minutes of this, we figured it out. He was asking for a piece of bubble gum.
A childhood belief about chewing gum

others believed things like this
- I used to believe that my mother invented peanut butter and jelly sandwiches. Anon
- 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 thought that barf was what they used to make peanut butter and jelly sandwiches!— Maan o' War