When I was around 12, instead of saying "condos," I'd say "condoms." It took months for my parents to correct me. They thought it was hilarious.
A childhood belief about speaking

others believed things like this
- My sister used to think that because I was 15 months older than her, I would die 15 months before her!— Nicola Braden
- I always thought that after 1999 it would be 1990 again, but with different months and days of the week
— optional - My 7 year old nephew holds the opinion that the correct name for a pidgeon is a "city chicken".— Bastard
- I believed that wind was caused because the trees moved. I was completely sure my conclusion was correct.— Glenr
- I always wondered why shepherds washed their socks by night. (correct lyric: watched their flocks)— MaggieNJ
- Ironically my parents were born on the same day; so growing up, I thought all parents had the same birthdays. Anon