A girl in our primary school class had been kept back a year because of learning difficulties, so - presumably to prevent her from feeling worse about it - the teacher forbid anyone from saying "stupid". Being one of the smarter ones, it was obvious to me that calling someone "stupid" wasn't very nice, but 2 years later when I told someone "I don't like football, it's stupid!" the whole playground fell out with me. In our small school words like "bum" and "poo" were okay, but "stupid" was just far too far. If someone said it you would run to the teacher and whisper "James said the "s" word!" in her ear.
They must have thought that we were terribly brought up.
A childhood belief about swearing

others believed things like this
- a blowjob is were a girl blew ur penis up after sex.......stupid i know.— james
- i used to think that the word "stupid" was a curse word, ranging in scale right beside the "f" word.Anon
- I thought Santa was the President of the North Pole. It was stupid I know
lol— Lynn Wright - When I was a kid, I used to think that an oxymoron was a stupid ox.— Froogle
- As a kid I thought dogs stupid but funny and that cats were evil demons. — Gemini
- When I was in elementary school I use to think that teacher lived at school at their desks all year long.Anon