Free Work?

The same week the boys were at my grandparents, my grandpa was doing some tractor work for a neighbor. He had knocked down a tree branch and scattered pine cones. Anyone that knows my grandpa knows that he would never leave pine cones all over someone's yard. So, he gathered up the boys and took them to pick up pine cones. They had only been working a minute when Charlie looked up at my grandpa and asked, "Now, are you getting paid for this, or are you doing this for free?"