Valve, valve, valve. You have the greatest ideas and make them reality in the funniest way.
For those that don't know what I am talking about. Valve has made a new game mode for Team Fortress 2. All complete with comics and videos! (even if you don't play the game I'd recommend reading the comics. They are funny as heck)
Basically it is sort of a co-op/tower defense version of the classic shooter. Robots attack some buildings and you have to stop them. They run on money and collecting it allows you to buy upgrades for your weapons and stuff.
And the stages are brimming with details again. For example to protect Mann Co. Headquarters you mercenaries built a decoy facility (called decoy). Every sign is hand painted and there's even the buckets with the paint still lying around and unfinished signs. In another map (Coal Town) in the spawn room is a museum showing such awesome things like: The first piece of coal ever mined here or newspaper cutouts showing headlines of Saxton Hale (CEO of Mann Co.)
They took something simple: A shooter where 9 different classes blow each other up on maps that make no sense (why would 2 opposing fractions build their headquarters only a few meters from each other and perfectly mirrored?) Then they added a little spark of life, the taunts and one-liners of the characters, and it turned each of the classes into something distinctive. And from there the spark grew into a fire which is now a crazy universe full of action and fun.