Probably the worst way to die, second of course to dying slowly and painfully. The kind of death that I'm talking about, though, isn't the kind where something falls on you and makes you stop living. Its more of a death where you didn't realize it was going to happen until it did, and after it happened you had enough time to realize what had just occured.
And in that pain, the pain that is the last few moments of your life, what would you think? Maybe in that last moment you find God. Maybe you think about your loved ones and how they meant more than you ever realized. Maybe you discover that your motivations, whatever they had been, were all wrong and futile. Whatever happens in those moments of pain before the void of unconciousness, I'm positive it has to be one perfect moment of beauty.