Written by Robert Bevan, the Critical Failures series starts with a group of Caves and Creatures players hiring someone off Craigslist to play Cavern Master and run a game. When they offend the Cavern Master, the man magically transports the group into the game! 

Critical Failures has a lot of great characters and well plotted stories thrown in amongst a massive amount of immature dick and fart jokes. It starts simple with a handful of characters trying to get home, and grows more and more complex as more characters join the story and everyone splits up to do their own thing and find their own ways.