Disclaimer: I'm not suicidal and please do not read this post if you are
http://en.wikipedia.org/wiki/Quantum_suicide_and_immortality
basically if you are all your memories + your awareness, and there are either infinite universes or infinite time, if you die will you just instantly re-gain awareness in another universe or time? also if gestalt psychology is valid, and our environment is part of our identity, then might we even just pop back exactly where we died?