

Gradually escalating unidentifiable whispering. Everyone starts asking if you can hear something, you all start agreeing you can hear whispering but not what it is, then the paradolia kicks in and people start hearing what they expect to hear. The constant gradual increase in volume. Increases the fear and certainty in what people are hearing, but also disrupts sleep and wakes anyone who was sleeping. Soon everyone is awake, sleep deprived, and panicked.
Hats, almost completely removed from formal settings and now only in informal settings.
People have a much more rigid and accurate sense of time. You don’t meet for lunch, you meet at 12pm on the dot. People don’t wait for someone for half an hour, they wait like 5 minutes or so.
People talk much more openly about problems and their views. When I was young people didn’t really talk about religion, politics, medical issues, and so on in public. Now people will tell you they are on an antidepressant or LGBT+ and be open about things.