Favorite Kurt Vonnegut Jr book?

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What is your favorite story written by the late great, Kurt Vonnegut Jr? My favorite would have to be Sirens of Titan, it has the best emotional ending to any Vonnegut work, and is just near pitch perfect science fiction. Right behind that would have to be Cats Cradle, which was also the first Vonnegut book I ever read. So, what about you?