There are lots of markers of age in a time of great technological change. But one rarely remarked upon, because it really has almost nothing to do with technology, is going to movies on time. In my youth, it was quite common to go to the movies (whether dropped off by your parents at the theater or brought with your parents) without any notion of what time the movie began. You arrived, sat down, watched the movie from wherever it was at that time, watched a few trailers and cartoon features after the closing credits, began watching the movie from the beginning, and with the invariable phrase “This is where we came in” leave when the movie returned to your starting point.