get this, when making the movie the directors had a smart,funny,mean idea. Get a large amount of actors and dress them up as regular civilians then put them in a public area such as a shopping center or park and have them drop dead. When they all drop dead (same time and area) the ordinary civilians were freaked, confused, and scared. Doing this allowed directors to film people having a natural reactions to all the people droping dead. you can see this on youtube....