I don't think that Slaughterhouse-Five was successful movie material. In fact, Vonnegut's books mostly I don't feel are movie material.
“All that writers can do is keep trying to say what is deepest in their hearts.”
“I played from the time I was seven years old. My father was my first baseman coach. I had opportunities that I never really pursued - with some Miami teams and a few larger colleges, and then I ended up bailing and began cooking.”