My Boyfriend recently admitted to me that up until the time he actually felt one he believed breasts were almost completely solid. He thought (and this is the example he used) that touching them would be like holding a slightly larger than average tennis ball.
He remembers being really confused about why women wore bras as they seemed to him to serve no real function.
A childhood belief about general

others believed things like this
- i used to believe that bras were bullet-proof vests for women.— emily
- I used to belief that the Muslim women who wore their garment wore it because they were bald.Anon
- i used to believe dragon ball z was real
and namek was in another dimension
and every show on tv was realAnon - my boyfriend used to think that Hanna and Barbera were two women that did all the cartoons— Helen
- Until I was 8 I used to think that women who wore eye liner were witches. — Will
- when I was little, I was scared of taking the plane because I thought clods were solid !! — valentine a french student in eigth