When I was little, I used to get "bastard" and "mustard" confused. I thought "mustard" was the insult. As a result, if I wanted to insult someone, I called them a "mustard"... this led to a great deal of confusion. Now, about 12 years later, me and my friends use "mustard" as an insult to people who don't know the story ("You're a mustard!").
A childhood belief about swearing

others believed things like this
- My mom used to tell me if I ate mustard I would grow mustard.Anon
- My friend believed that eating bread crusts or eating mustard will give you curly hair.— Linda from Southern California
- the beatles song 'mean mr mustard' says "shes a real go-getter", i was sure it was "shes a real coconut"...— sally
- I thought that grape juice was called "great juice". Anon
- I used to believe that people from Holland were called "Hollish", like people from Poland are called "Polish"— Sally
- I always thought 'virgin' was Marys star sign and could never work out why it was such a big dealAnon