At my office, a common phrase you'll hear is, "Just calm down!" It'll be said, humorously, after someone is dramatizing a situation; personal or business related.
Newsweek ran an online retrospective of the past decade. One of the features was overblown fears. The top overblown fears of the aughts were things like Y2K, shoe bombs, web predators, and Anthrax, among others.
What can we learn from this? Don't watch the news and "just calm down!"