When I was a child there was a campaign called "keep Britain Tidy" . I was firmly convinced for many years that what I had heard was keep brit and tidy - like spick and span . At about age 11 it finally dawned that there was no such word as brit!
A childhood belief about speaking

others believed things like this
- that we celebrate New Year's because it is the day that Jesus had his brit (circumcision)Anon
- I used to believe that we got sausages from pulling them out of pigs bums - all neat and tidy. Mmm— L. Webb
- I used to think that the word Great was added to Britain because they won the Second World War.— Age
- As a small child I believed that the word was "nakeup", finally I found out that it was actually "makeup".— Hannnah P.
- My great-grandfather firmly believed, and had me convinced, that SPAM was mouse meat. — texasblue
- For years I heard the word "pedophile" and thought it meant a pedicurist's tool.— Lauren