Haunted Doll Posse is a oneshot comedy horror game about a group of spirits possessing the same haunted doll.
The PDF is 6 pages with a bare but easy-to-read layout and impeccable cover art. Seriously, it's hard to turn down the cover---the framing and expression on the doll sells the game, and this is a good thing, because it's a good game.
Gameplay-wise, Haunted Doll is quite simple. Each player is a different type of ghost with a different objective to achieve. However, only one ghost can control the doll at a time.
Characters are created with random roll tables, and there's enough variety that a 4--5 player group shouldn't have significant overlap. Powers---the unique ghost abilities that everyone can spend resources to activate---will tend to have some duplicates within the group, but every player also gets a fully custom Unique Power, ensuring that at least one character element will always be completely unique for every ghost.
Haunted Doll's dice system is straightforward. You roll a d6, succeed with the most benefits on a 6, and fail with the most consequences on a 1. Character traits, support from other ghosts, or other positive conditions can add dice to your roll and allow you to take the highest result. Or, for negative conditions, they can remove dice or force you to take the lowest result.
The doll that everyone's controlling cannot die (unless your group wants to steer in that direction,) but it can get dinged up, hampering the rolls of whoever's piloting it. Ghosts can also fight for control of the doll, or aid or hinder the actions of whoever's piloting it. However, doing this always opens up the helping/hindering ghosts to consequences from the roll and ensures that the non-pilot ghosts cannot meddle without risk.
Because of all of this, Haunted Doll Posse feels like it has a very high chaos potential. The more the doll fights with itself, the more it will fumble rolls and get into trouble, until eventually at some point the ghosts have to join forces to keep it intact. This push-and-pull between cooperation and reckless squabbling propels the game, and makes it an ideal candidate for high-energy oneshots.
Overall, if you're looking for something that transforms the haunted doll genre into a wacky comedy, or if you want a wacky seasonal oneshot, this should absolutely be on your shortlist.