When I was about 3, I thought my 1 year old brother was a girl because A: I couldn't see his penis, and B: I thought every family had to have at least 1 boy and 1 girl for children.
A childhood belief about family

others believed things like this
- When I was younger, I saw Madonna's video for "Material Girl". I thought she was singing "I'm a Cheerio Girl"!— Greg
- I always thought instead of saying "Im a material girl" Madonna was saying "Im a cheerio girl".— Tiffany
- I used to believe that the words to Michael Jacksons "Liberian Girl" were "librarian girl".— Paul
- My 3 year old little girl announced after spinning around for ages that she was 'feeing guilty' :-)— Adam
- That Madonna sang "I'm a cheerio girl" instead of material girl— HN
- I used to think that Cain and Able were brother and sister (with Able being the girl).— Duh