After I found out that sugar was made of carbon, hydrogen, and oxygen, I thought that I could make sugar by blowing into water. Why? Because the carbon from the CO2 you exhale would combine with the H and O in H2O and result in sugar. Not just any carbohydrate- but sucrose table sugar, the brown one.
A childhood belief about chemistry

others believed things like this
- 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 - 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
- My mum told me that if I ate sugar from the sugar bowl I'd get worms.— QueenB
- I was told as a child to eat the dark parts of a banana, because it was really brown sugar.Anon
- when in was little i used to think that cocaine was sugar until i found out what it was— jamie dulake