From Richard Bach's book Illusions comes the following:
Perspective--use it or lose it.
If you turned to this page, you're forgetting that what is going on around you is not reality.
Think about that.
Remember where you came from, where you're going, and why you created the mess you got yourself into in the first place.
You're going to die a horrible death, remember. It's all good training, and you'll enjoy it more if you keep the facts in mind.
Take your dying with some seriousness, however. Laughing on the way to your execution is not generally understood by less advanced life-forms, and they'll call you crazy.