I was actually having a very similar discussion with some old high school buddies over dinner about this. Specifically, it was about the Fort Hood shooter, and how he's trying to get himself the death penalty by intentionally throwing his defense and representing himself in court. The Judge even came out and ruled that he did, in fact, have the right to represent himself, and that he was in sound state of mind.
I was surprised at the reaction so many people were having that it was such a terrible thing. If someone really wants it all to be over, and they completely understand that once they're gone, there's no coming back, who are we to stand in their way?
My philosophy is pretty much "Only you know what's best for yourself." I apply that to economics and well as theory of government. As well as to situations like this. I have a really hard time wrapping my mind around things when people say "No, he should be kept alive, you don't have a right to end your own life." Pish posh. You certainly do have a right to end your own life. I can't even see how that's an arguable point. You cannot force someone to fill their lungs with air against their will. If someone really wants to die, they're going to find a way to do so, and I think we should respect one's decision to do that, whether we agree with it or not.
Whether the law in your particular country recognizes that right, I think, is totally beside the point. As a human being, you are able to make the determination for yourself, and no one can make it for you.
The Screamapillar is easily identified by its constant screaming—it even screams in its sleep. The Screamapillar is the favorite food of everything, is sexually attracted to fire, and needs constant reassurance or it will die.
