When I was too young to drink Coca-Cola, my dad said it was an "adult drink." He later told me that he laughed while drinking Coke when he was a kid, and I was confused. He then explained that he was more of a teenager.
A childhood belief about drinks

others believed things like this
- 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 you had to be an adult to drink household chemicalsAnon
- I used to think that if you mixed a diet drink with a regular drink, it would explode. Anon
- When I was young I refused to drink well water because I thought it came out of whales.— itodd
- My friend told me you have to drink milk to get boobs LOOL— Roxanne
- That you had to be a male to drink beer.— andrei gaspar