I have no imagination, so I've never been interested in playing Dungeons and Dragons (aside from the old cartoon). But the live games Mike Krahulik, Jerry Holkins, Scott Kurtz, Wil Wheaton, and Chris Perkins play before a large audience each year at PAX are miracles of live storytelling. This year's adventure was a hilarious, exciting, and entirely unpredictable delight. You can watch the video of the game above, or download the two hour long podcast here. It will make your next long commute a pleasure.
(If you've never heard any of their adventures, keep in mind that Kurtz once got Wil's character killed by initiating a chain if events that culminated in Wil's character dissolving to death in a pit of acid.)
You can see more of the best of 2012 here.