In Belgium, euthanasia is legal, which means the state will assist people who wish to commit suicide. Most cases involve people who are dying, and want to avoid unnecessary physical pain. But a growing number are for people who are in mental pain, and want to end it all.
Suppose you've been given a few weeks to live, but you've decided you don't want to spend your last days in a hospital bed. What if you decide, "Today is a good day to die," in a suitably stentorian Klingon voice? And you want a method of self-annihilation that's both interesting and nearly pain-free?