I was a vampire in my previous life.
Ever see the movie
Chances Are? This guy is killed while crossing the street on his way to his first anniversary dinner. When he goes to Heaven, an angel tells him that he can be reincarnated... the guy quickly runs off to be reincarnated that the angel doesn't get a chance to give him his memory-wipe shot (a shot that is given to all people lined up to be reincarnated). So, when the guy is reborn as another person and grows older, he begins to remember everything from his past life.