A few years ago, my wife went on vacation with some work friends. At the time, traveling was not really my thing, so I stayed home and had a few days to myself. The people she went on vacation with were made up of several couples, a single female and a single male. We'll call him Rick. She told me, early in the trip, that Rick was taking an interest in her. So I told her, "what happens on vacation stays on vacation," and...