Every kid in our family has been brought up with a belief that if they drink tea, their skin will turn black and only once they are adults they can drink tea. Sickness was an exception though :p
A childhood belief about drinks

others believed things like this
- I used to think that if you mixed a diet drink with a regular drink, it would explode. Anon
- When I was little my dad told me that if you drank too much coffee it would make your skin turn black. Anon
- i knew that if you ate beets your urine would turn pink and i thought if it was pink, then you could drink it.— JP
- That you had to be a male to drink beer.— andrei gaspar
- I used to believe that you needed a prescription to drink Dr. Pepper.Anon
- I used to think it was illegal to drink hot chocolate in the summer. — Samantha