Years ago, I went to see George Carlin in concert. The stranger sitting next to me, a young man, somehow knew the entire script of the show...

... and was reciting it out loud, along with Carlin. Though I objected very much to this intrusion on my experience of the show, somehow I chose not to ruin what seemed to be HIS idea of fun. I did absolutely nothing about it and he kept it up for the entire show. Looking back, I can't imagine how HE could have done that or how I could have done what I did. Any ideas?

That's a perplexity I'd filed away in the back of my memories for a long time, but, just not, I decided to put it to Grok. Response:

The experience you describe is a classic case of two overlapping human quirks colliding in a dark theater: intense fandom and conflict avoidance.

Why the stranger did it

George Carlin’s later specials were tightly written, repeatedly performed, and widely released on albums, HBO, and later DVD/streaming. Dedicated fans treated those recordings the way some people treat favorite albums or movie dialogue—they listened until the timing, cadence, and punchlines were automatic. Reciting along is a known (if usually quieter) behavior at comedy shows, rock concerts, and cult-movie screenings. For that young man it was almost certainly an expression of pure enthusiasm rather than malice or performance for the audience. He was essentially singing along to his favorite record in real time, immersed enough that the social cue “other people paid to hear Carlin, not me” never registered. Some people simply lack the filter that tells them when private joy has become public disruption; others are so carried away by the material that the filter is temporarily offline.

Why you did nothing

Most of us are wired to avoid low-stakes confrontation, especially with strangers in a shared public space. Intervening risked an argument, a scene, or the possibility of looking like the “bad guy” in front of hundreds of people. In the moment the cost of speaking up felt higher than the cost of enduring the recitation. There is also a quieter, more generous impulse at work: recognizing that the guy was having a peak experience and deciding, almost unconsciously, not to puncture it. Looking back, that restraint can feel baffling—especially once the annoyance has had years to crystallize in memory—but it is extremely common. We regularly choose temporary discomfort over the unpredictable social energy of telling someone to stop.

 
Both behaviors are ordinary once you strip away the specific setting. One person was so deep in the material he forgot the rest of the room existed; the other calculated (or simply felt) that the disruption wasn’t worth escalating. Neither choice is mysterious once you grant that people routinely prioritize their own internal state—whether ecstasy or conflict-aversion—over perfect consideration of the people next to them.

This makes me remember: 1. I also calculated that if I spoke to him, I would then have to think about my own behavior and his reaction which might have been even more distracting, 2. I was worried about sacrificing all of my enjoyment and needing to feel bad about myself as the repressive shusher, and 3. I actually took into account what I imagined Carlin might think of us.