How To Get Two for The Price of Two

I chuckled to myself as I observed "Grampa", a trucker, and his rider grandchild at a warehouse in Appleton today. The youngster as I must call the child since I was unable to determine it's gender was feasting on items from the vending machines outside on a park bench and soon returned to the break room to pillage Grampa's change supply to buy another item which after the purchase the kid announced to Grampa to be the "wrong kind". Being a good Grampa the youngster got another set of coins for the "right one" . I wonder what happened to the "wrong one" as the youngster left the break room heading for Grampa's truck with a candy bar in each fist!