This is a couple of years old, but chances are it's new to you. It's new to me thanks to Sarah Morean at The Daily Cross Hatch.
What it is is Zander Cannon's 12-Hour Comic from 2009 about a group of junior detectives who have to solve a case about a water-stealing skeleton with a death-gong. Cannon created plot points for himself by drawing a random Pictionary card from a pile and getting the following words:
He drew another card for his characters' names:
Click the link above to learn more about how he did it or go straight here to read the comic.