Would you ever consider killing yourself?

Now, I'm not condoning suicide or making any unseen implications here. I am just curious as to whether you could ever see yourself getting to the point where you'd be willing to kill yourself, or if you have ever seriously considered it or tried to do it before. I don't want to see any replies like "that's so emo" because this is just curiosity, and wondering how people feel about the subject. And even if you feel sure that you would never do it, could you ever concieve it happening?