For some reason, I always thought baked beans were "bacon beans." I think I just called them that one day, and my family stuck with calling it that, because they thought it was cute. So, when I'd be in the lunch line in school and ask for "bacon beans", I never got what was so funny. It took a very long time for me to realize I was using the wrong word.
A childhood belief about general

others believed things like this
- That baked beans were made of pasta! Spaghetti is?!Anon
- My mum used to tell me that baked beans were just peas covered in tomato sauce.— munky
- I used to think that
"The land of make believe"
was
"The land of baked beans."— Baked Bean! - I used to think people were called "human beans".— Dave
- Until just a few seconds ago, I thought gherkins were beans or something weird like natto...Anon
- I used to call the rays of light from the sun "sun BEANS". That's what it sounded like to me.Anon