the double whammy

When I was very young, probably around 6 years old, there was an event that occurred that I have never forgotten. After school one day my friend suggested that we buy some candy and she gave me a nickel. We went to the store. I paid first and gave the man my money. When my friend paid she gave him a dime and he gave her a nickel back in change. She turned to me and said “here, he gave me your nickel”. I tried to explain that it was no longer mine and only her change. She didn’t understand. There was no changing her mind. I surrendered with candy in one hand and a nickel in the other.