When I was 10 my friend told me that a girl in her neighborhood was a werecat and that she turned into a cat while they were swimming one night and got cat hair in the pool. I truly believed this story since I was(and still am) very interested in werewolves and werecats. Then when I met this girl, I noticed some things that confirmed my belief that she was a werecat like she was wearing cat ears and, this is the freaky part, she looked exactly like the girl on the cover of the R.L. Stine book "Night of the Werecat"!
I believed that she was a werecat for a few months until I got the courage to ask her.
A childhood belief about monsters

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 used to believe that the words to Michael Jacksons "Liberian Girl" were "librarian girl".— Paul
- I believed that the ladder on the back of a trailer/rv led up to a swimming pool.— marilese
- Up until I was in 3rd grade I believed my bathing cap is what kept me afloat in the swimming pool! Anon
- That Madonna sang "I'm a cheerio girl" instead of material girl— HN
- I always thought instead of saying "Im a material girl" Madonna was saying "Im a cheerio girl".— Tiffany