Serial

Basically, it’s a hitch hiking horror story but it’s cool in that 2 horror authors got together and experimented. They each wrote a chapter on their own that defines their character and motives (and some gruesome killing), which they kept private from each other. They co-wrote the 3rd chapter, 100 words at a time, without knowing what the other guys character was about – they responded to what the other had written next. The serial killer characters were strangers to each other and were thrown together in the same car. The end result is really good, IMO.