336: Is there a truly selfless act?

Today's caller was in line at a drive-through coffee place, and decided to pay for the people behind her in line. But she realized that, in the course of doing so, the rewarding feeling she got from the act may have been the reason she did it in the first place. And that led to her question: 'Is there actually an unselfish act? And if there isn't, are we doing it for the right reasons? Can there even be an unselfish act and if there is, would that be good?'