When I heard stories about the Civil War I always thought it was the Silver War. Based on having attended my parents' twenty-fifth wedding anniversary and knowing that they had been married twenty-five years, I figured that the Silver War was twenty-five years after the preceding war.
A childhood belief about wars

others believed things like this
- I thought the Civil War was the Silver War.— Vicki J.
I used to believe that some insects had twenty lives.LOLAnon- I used to believe that twenty was the largest number in the universe.— Bernardo Fernandez
- Just this moment I learned that earwigs do not go into your ears, i'm twenty-four.— Sheila
- I used to believe there were numbers called "onety" and 'twoty." I thought "twoty-nine" came before twenty.— CC
- I used to believe that having children could only happen after a wedding with the person you are married to.Anon