I used to believe that if you drank same thing and swooshed it around in your mouth, that it would turn into pee.
A childhood belief about drinks

others believed things like this
- I used to believe that if you drank coffee before you were an adult, your skin would turn gray. Anon
- When I was little my dad told me that if you drank too much coffee it would make your skin turn black. Anon
- if you drank coffee before your 16th birthday, your skin will turn purple.Anon
- I used to believe that men drank beer and women drank wine. Anon
- I thought a "cold sore" on your mouth was the same thing as "coleslaw" and so avoided eating it for years.— Helen (UK)
- When I was little, I used to think that if you drank beer you would die right after you drank it.— I'm so stupid