Hmmmm..... 5 books? Ive got 4.

HHGTTG
TRATEOTU
LTUAE
SLATFATF

So, whats the fifth?

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Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to slide in broadside , thoroughly used up, totally worn out, and loudly proclaiming --WOW-- What a Ride!