You receive an emergency alert: "BALLISTIC MISSILE THREAT INBOUND. SEEK IMMEDIATE SHELTER. THIS IS NOT A DRILL." What do you do? How do you think your neighborhood will react? What memes be on Lemmy?
Assuming it's nuclear, sit around and mourn the fact I don't have a basement. Hope that either A: missle defence works, or B: I'm in the evaporation zone. Radiation sickness sounds awful.
Even if the explosion and fallout completely missed my area, I think EMP disruption would be a huge issue and lots of people would be panicking, stealing, murdering trying to survive.