My mother used to believe that the word "shit" was a minor curse on the level of "damn it", and therefore thought it wouldn't do much harm to say it around the kids. She's in her forties, and she only found out the truth recently!
A childhood belief about swearing

others believed things like this
- sophie b. hawkins. Damn I wish I was your lover. I heard Damn I wish I was your motherAnon
- i used to think that the word "stupid" was a curse word, ranging in scale right beside the "f" word.Anon
- I thought "sake" was a curse word— shh
- My sister used to think that "spit" was a bad word. She meant "shit".— "Spit!"
- up until recently I thought intern was just another word for a secretary (I'm 27 btw)— Axecutioner
- my husband believed, until recently, that the word "several" meant seven of something. — sheryl