The scientist in me answers, "Nothing interesting". I.e. Nothing at all.
The philosopher in me says, "Everything". Think Schrodinger's cat.
The optimist in me hopes that I have some choice in the matter over theoretical afterlives. So far, I quite enjoy living and think that when I'm finished it would be fun to start all over, see what happens, and try to enjoy myself along the way.
Reincarnation seems almost as much fun as playing KOTOR the second time.
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