When I was young I used to think that "sugar-free" chewing gum meant there was a special offer, where you could get a free bag of sugar if you sent off the wrapper!
A childhood belief about chewing gum

others believed things like this
- I used to believe that when cordial drink said 'sugar free' that you didnt have to pay for the sugar in it!— Grace Lyon New Addington
- I thought that a "sugar daddy" was a father who let his kids eat all the sugar they wanted.Anon
- adding too much sugar to foods would give you "sugar worms"...
Anon - My mum told me that if I ate sugar from the sugar bowl I'd get worms.— QueenB
- When I first heard Matt Monro's song "Born Free," I thought he was singing "Porn Free."Anon
- When i was a tiny lad, I used to think drug free zones were places where you can get drugs for free— Spencer