When I was a kid there were these action figures for some show (I think maybe X-men) that on the back of each box had a little profile for the character they depicted that included their real name. However one of them for the real name just said "Unknown" and being a little kid I thought their name was actually "Unknown!" which I thought was a really weird name and also wondered why they didn't have any last name..
A childhood belief about toys

others believed things like this
- i used to believe dragon ball z was real
and namek was in another dimension
and every show on tv was realAnon - I used to believe the T.V show "War of the Worlds" was for real, that those aliens were REALLY coming for us. — Adelaida
- After watching a crazy TV show, I believed that aliens were real. I still have a little fear of them. — Niki005
- I used to believe that the heart at the beginning of the I Love Lucy Show was made of real chocolate.— Krissa
- I used to believe that boys were like robots and had no real feelings, that they were not even real people.— Lisa
- i used to believe that the telly tubbies were real because the rabbits are real!!— hotty