When Interstellar came out, every single undergrad at my university who was doing work for a LIGO project, half a dozen assorted physics majors, and half a dozen engineers all went out to watch it with the explicit intent to talk about the physics of it. It was at an IMAX and we were basically the only people there, and we asked the few who were if they’d be okay hearing us talk during the movie. (They said yes, I think they were interested in what we’d say.)
We also happened to love the movie along the way, but we got deep into the physics of it. Like, deep deep. General relativity shit, the math of causality violation, so much deep niche physics. And then one of the engineers casually commented, “Hmm. None of those are the big problem though.”
All us general relativity people: “Oh?”
Engineer: “Yeah. The real problem was that they needed the really big rocket to get off of earth but only those tiny itty bitty landers to clear a gravitational field so intense it causes massive time dilation.”
All us general relativity people: suddenly and intensely coming to terms with how obvious that was and how badly we missed it
Engineer: “Physicists.” (affectionately derogatory)