Many invest with what I call a "sunny" attitude. Like a surfer dude, they have ridden a beautiful curl and are basking in the sunshine at the end of the run. It is truly an exhilarating feeling.
It is always essential to be prepared for difficult times. Investments, like life, don't move in a straight line. Believing otherwise ought to be considered insanity. Any seasoned person who has lived for a long time will confirm this.