When my brother and I were younger my mother used to say "sugar!" instead of shit as she didn't want us kids to learn to swear. Consequently my brother thought that all such words were swear words and called me a "stupid cocoa" for years after.
A childhood belief about swearing

others believed things like this
- I thought there were some swear words so bad if you said them you would go to jail!— Mexicrat
- I thought that a "sugar daddy" was a father who let his kids eat all the sugar they wanted.Anon
- When me and my brother were kids we used to think that Jim'll Fix it's Jimmy Saville was called Jim'llAnon
- When I was at primary school I thought you had to be at least 18 to swear.— Mike W
- I used to believe that swearing was just saying, “I swear!”Anon
- I used to believe that bizarre was a swear word.Anon