Looks like some dude was hanging out at your library the other day and just happened to catch some footage of your girlfriend.
This is one of those situations where at first you think “You know what, good for her. She’s just having fun. I wish I loved something half as much as she loves whatever she’s listening to. I wish I was less inhibited with my false sophistication and innate but often misguided sense of social propriety and could just be free with my enthusiasms.” And then about ten seconds later you think “Someone call a hospital.”