Y: The Last Man #29 and Volume 4: Safeword
Vaughan and Guerra are masters of the cliffhanger. Almost every issue drops a bomb on the last page making the 30 day wait just hell. This is how monthlies should be written. The title is really designed to be read monthly but I recommend reading the four collections then switching over to the monthlies. After reading the trades you will not be able to wait the agonizing months until the next collection is published.
You Dig?