One positive thing that occurred in our household is my wife slowly but surely built up about three months of dry goods, laundry soap, paper goods etc. She didn't panic buy or "hoard". She just bought extra of everything that didn't spoil when she was out.
When this happens again and things may end up going more nuts, we're good to bunker down for months. If she started burying food in the backyard, I'd have to put the kibosh on that!