We were far too busy a-wassailing yesterday to notice, but Valve released a soon-to-be-holiday-classic that we think is going to catch on like wildfire. It's the latest track from Left 4 Dead 2's quartet of bearded troubadours, the Midnight Riders, titled "All I Want for Christmas (Is To Kick Your Ass)." It's a lot like that one song with the similar title, only ... with more ass-kicking, we guess. Unsurprisingly, it's not suitable for work -- but incredibly suitable for your family gatherings. Click past the jump to rekindle that holiday spirit.