In our house we used to have a medical dictionary called the Funk & Wagnell. If me or my brother had something wrong with us Mum or Dad would tell us to "look it up in the Funk & Wagnell" but of course to our ears we heard "look it up you f**ken wagnell". We always wondered what a wagnell was and why our parents were swearing at us.
A childhood belief about swearing

others believed things like this
- i used to believe that the f word was "funk"!!! Anon
- I thought that parents made a baby by nibbling each others ears.— Mer
- When I was a kid I heard that the Beatles did acid and I wondered if they melted from it.Anon
- When I was a kid, I wondered why they called it "public hair" when it was so private.Anon
- I used to think that blood flowed down one leg and up the other.
And I'm applying to medical school....— Nat - I used to believe that swearing was just saying, “I swear!”Anon