Coconut Water

During my 5th grade vacation I was in my grandparents (GP) place for one month. During my stay , my GP's relatives who lived in abroad visited to see him . My GP gave coconut water and they told I had it in my home town and added there(in abroad) it will be sold in carton. I understood as cartoon and didn't clarify with anyone till I was a teenager and after that learned the difference between cartoon and carton. LOL