When I was in like 5th grade or something I watched the movie "Juno." There's that one part where she says "Mom! You's a dick!" I asked my mom, what that meant, and she said it meant "a mean person." For a while I thought all swear words were just meaningless insults that for some arbitrary reason were worse to say than something like "meanie."
A childhood belief about swearing

others believed things like this
- Circumcision meant getting your dick and testicles cut off— John
- I thought when a movie was unrated it meant it was so bad it exceeded all the ratings!— Oizys
- When I first heard the words "flea market", I actually thought it meant "selling fleas".Anon
- I thought that a person's motorskills meant how good they were at driving!Anon
- When I was in sixth grade I thought that "oral" sex meant talking about sex.— Duh
- I thought the phrase "At one's disposal" meant you should dispose of the person or thing.— Geirskogul