A wise person thinks a lot about death,
    while a fool thinks only about having a good time.
Ecclesiastes 7:2-4 NLT

Death! 

The word puts terror in our bones! We know it's coming but we ignore it when we can, and we act like we will live on this earth forever. But then there's the health crisis, the loss of a loved one, the thoughts in the darkness of night, the day-mare or nightmare. And the realization of the truth of where we are all heading (some of us sooner than later) comes sneaking or crashing in. And then we have to face the inevitable or drown it all out with some artificial comfort.