Unavoidably slightly political but...
I saw a shift in behavior following Trump's conference appointing Mike Pence as the effective coronavirus czar.
Every morning there was a small stash of N95 masks at my local Home Depot until yesterday. Similarly I started seeing specific sorts of non-perishables disappearing from the shelves of Trader Joe's and Safeways. Where it goes next, I don't know. But I think the crowd has spoken on the subject already.