I didn't get the saying "waste not, want not" meant, as I didn't know "want" could mean "lack" and only knew of it as in "desire", so I thought the saying meant "If you don't want stuff you won't be wasteful", which obviously doesn't make sense.
A childhood belief about speaking

others believed things like this
- I thought that socialism just meant being social and didn't get why anyone would be against it!— Olcasgean
- Up until I was 17 I thought that 'no outlet' signs meant that the steet didn't have any streetlights.— Kelsey
- I thought when someone was described as being "mild-mannered" it meant they didn't have very good manners— Samilton Duerheiser
- As a kid, I thought "No Outlet" signs meant the houses past that point didn't have any electrical outlets.— Julie
- That the white stuff coming out of aeroplanes meant that someone on the plane had just got married.Anon
- I used to think that when I saw someone on TV whom I knew to be dead , it meant that it was his or her ghost.— Sophie