Lack of control
On the animals programs today one often sees a zebra grazing, relaxing, maybe in season one male bluffing with another male and in general going about their business. Suddenly, out of nowhere a lion strikes and the zebra is fighting for his life, and then is no more. It's like life today. You are one of the herd and then suddenly you are terminated. To be aware of this causes a helpless feeling, a situation that you have no control over. At any point a car could be trying to beat a red light and change your life. It can be scary.