Bangkok, at least pre-COVID, metal detectors at all underground station entrances and all department stores. All with security guards. All waving people straight through while the things beeped alarmingly. Worst was when a tourist paid attention to the signs and attempted to show the security guard the contents of their bag. Eyes rolling everywhere as the crowd backs up, waiting for the guard to get them out of the way as fast as possible. But despite all that, they still insisted everyone actually had to walk through the detectors and you would be blocked if you dared try to enter through the exit door (without a metal detector).