I was in line at the bank, and I was in a hurry. The couple in front of me had to hop out of line, so I got to move up. But they were only gone for a minute... So when they returned, I invited them to take back their original spot back. THEY insisted that I stay. The kind act we traded between us lightened the mood of nearly the entire line of grumpy people, and, at least for a moment, we shared a collective smile.