When I was little I believed that you had a limited number of words and a limited number of steps that you could take in one day. The limit was 100 of each (because 100 seemed like a very big number). If you went over the limit then you wouldn't be able to speak or walk until the next day when your limit was renewed. I remember being in a department store and trying to keep my sentences as short as possible and to walk only when I had to!
A childhood belief about going shopping

others believed things like this
- when i was little i believed that your social security number was the number you were born on the earth — christine
- I used to believe that there was a time limit whilst using the loo.— Helen
- I used to believe there was a limit on the numbers you could count — Carmen
- When I was a kid I believed that the number 11 was pronounced "onety-one"— Alicia
- I used to believe there was a number "eleventeen". I could never quite work out where it went, though.— Matthew
- I used to think boys went "number two" with their pee pees. Anon