Here's how it's played: I will go first. The person who goes first picks two authors, and the next person titles a hypothetical collaboration between these two authors.
Examples from prior games:
Kerouac + Poe = Suffering is Hip
Lovecraft + Miller = The Tropic of Azathoth
Plath + Powter = STOP THE BELL JAR!
Do read ALL the entries before you take a turn at the game, gentle reader: the bottommost entry should contain the most recent pair of authors.
To kick off, then:
What would J. K. Rowling and Nick Cave title a book they wrote together? (What, he's written a novel, darnit).
Now you: read the comments, come up with a title for the collaboration that hasn't gotten titled yet (last comment), then pick a pair of authors for the next player to choose.