I've been kind of puzzled, since the first time I gave it any thought, why "going to a movie" is culturally thought of as an activity one does with a companion, even a date. Much like dining out in a sit-down restaurant. Yet the expectation is that you sit in silence for 2 hours and spend maybe 5-10 minutes critiquing or raving as you walk out.
But now I'm wondering if the custom of doing this together is a vestigial one, formed in a time when the 'going to the cinema' was a more social event even as late as the drive-in era (I have never experienced a drive-in).