Oh, those summer nights: Here’s another of those perfect summer movies to which I keep referring – the kind that seem perfect TV diversions on slow weekday nights. This one, from 1978, somehow has managed to catch on with more than one generation, so road-test it with any young ones around. Chances are, they’ll like it, even with the lyrics slightly sanitized from the original Broadway musical production. Olivia Newton-John and John Travolta star.