The school installed new CCTV cameras in the corridor with what felt like real seriousness attached to the announcement. Expectation: behavior would shift, corridors would get quieter, some noticeable change would follow.
What actually changed: absolutely nothing, except that for the first week, literally everyone dramatically waved at the cameras as a joke every time they walked past, turning surveillance into a running bit.
The waving has since stopped, faded out naturally after the novelty wore off. The cameras remain up there, mostly unnoticed now, just a permanent, quiet background presence that nobody actively thinks about anymore.