Can credit cards buy everything?

I was using my credit card today to buy something and was reminded of this incident that happend some years back in my family. My parents had been on a tour, down south. They were taking a stroll at a nearby market when my father was boastfully describing the power of his credit card that could buy anything in this world with that piece of plastic.

Quick at her wits, mom said "okay now, buy me that balloon from that pedlar". I have never seen my dad flash his credit card before mom since then.