I have been thinking over the concept of Quantum Suicide lately.
To bring the unfamiliar up to speed (quoted from http://en.wikipedia.org/wiki/Quantum_suicide
"For example, a man sits down before a gun, which is pointed at his head. This is no ordinary gun; it's rigged to a machine that measures the spin of a quantum particle. Each time the trigger is pulled, the spin of the quantum particle is measured. Depending on the measurement, the gun will either fire, or it won't. If the quantum particle is measured as spinning in a clockwise motion, the gun will fire. If the particle is spinning counterclockwise, the gun won't go off. There'll only be a click.
Nervously, the man takes a breath and pulls the trigger. The gun clicks. He pulls the trigger again. Click. And again: click. The man will continue to pull the trigger again and again with the same result: The gun won't fire. Although it's functioning properly and loaded with bullets, no matter how many times he pulls the trigger, the gun will never fire. He'll continue this process for eternity, becoming immortal.
Go back in time to the beginning of the experiment. The man pulls the trigger for the very first time, and the particle is now measured as spinning clockwise. The gun fires. The man is dead.
But, wait. The man already pulled the trigger the first time -- and an infinite amount of times following that -- and we already know the gun didn't fire. How can the man be dead? The man is unaware, but he's both alive and dead. Each time he pulls the trigger, the universe is split in two. It will continue to split, again and again, each time the trigger is pulled, and becoming quantum immortal. This thought experiment is called 'quantum suicide'. It was first posed by then-Princeton University theorist Max Tegmark in 1997 (now on faculty at MIT). However, science fiction author Larry Niven originally proposed a fictional variant of quantum suicide in his short story "All The Myriad Ways" in which the protagonist final action in the story kills/fails to kill him in a myriad of alternate realities."