Reminds me of what we’re going through. Well, more at the beginning of the panic.
It was either The Birds, Invasion of the Body Snatchers (70s one), World War Z, or...? Could even be North By Northwest or The Impossible. Small window of time where everything seems OK, then chaos.
The main character is walking on a street or goes outside for a moment. Everything seems normal, and then something little happens that lets them know something isn’t right. And then there is sudden chaos.
It’s like when you’re walking and you feel a few drops of rain that warn you, you have a few minutes to seek cover, and then DOWNPOUR!
Any ideas?