Just watched Groundhog Day again on TV - what a great film. It takes on Nietzsche's theory of eternal return, which holds out the pessimistic prospect of your life repeating identically for all eternity, and then gives it a twist to say carpe diem!

Another book that takes on the same theme and attacks it from a very different perspective is Manifold Time by Stephen Baxter, which both confirms and rebuts Nietzsche's view with quantum mechanics.