Team Fortress 2 players beware! The game's first AI boss beheading your way, clippity-clop, clippity-clop.
He's the Horseless Headless Horsemann, a long lost Mann family member, and he appears randomly on spooky Halloween map Mann Manor. And he wants to kill you - providing the Manor's exploding pumpkins don't get you first.
Those brave enough can face the Horseless Headless Horsemann in battle. Slay him and an achievement awaits. It's called "Sleepy Holl0WND".
In addition to Triple-H (as I'm calling him), the Team Fortress 2 Halloween celebrations offer loads of themed costumes and items. You can buy them at the Mann Co. Store, and many will will be made by the community - we've already heard of the riches that can be earned by creative and enterprising fans there.