The way those snipers locked down Washington, I have no doubt that a well-planned series of attacks around the country would put a chill on people's shopping habits. Probably be good for online shopping though...
I remember that time well: my daughter and her family were living in Alexandria, VA. She was a nervous wreck, and so was I, out here in California.
The kids were locked down in school, they were doing the "duck and run" in and out of stores, people were scared to gas up their cars...what a nightmare!