As I child I always waited for the fizz to go down in my soft drinks before drinking them. But one day, in a fit of curiosity and bravery, I decided to drink my Coke sooner--only to find the bubbles never did go down, and the soda tasted funny too. For years I believed having the bubbles get stuck in the glass was the natural consequence of drinking your soda too soon, and was pretty close to adulthood when I realized I'd just gotten a soapy glass that day!
A childhood belief about drinks

others believed things like this
- I thought there was a legal drinking age for soda (I had always been told that soda was not for children).— Dial Zero
- I thought that soda was also called "pop" because if you drink too much of it, you'd explodeAnon
- I always thought there was a drinking age for coffee, because it was an adult drink like beer and wine.Anon
- I used to think when you farted, bubbles came out.— Nick
- I used to believe that eyes where just like bubbles and if you where to touch them they would pop.— Adam
- I used to believe that if I swallowed gum I would bubbles when I 'trumped'.Anon