Imagine a packed midnight screening. A phone in a pocket stays silent, and nobody notices. Then it buzzes, its owner glances down, and a small rectangle lights up the row. The other side's emergency concern is fair, and cinemas can handle it at the desk: leave a contact number with staff, step out if needed. But reminders and ushers only catch disruption after the glow appears; a pouch makes the norm automatic. That is not punishing the possibility of bad behavior, it is protecting the shared attention everyone paid for.