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Aargrooha
From Discworld & Pratchett Wiki
A troll game not unlike football, where you rip off a human's head and use this as the ball. Participating trolls then kick it up and down a field whilst wearing special boots made of obsidian until either a goal is scored or the ball bursts.
We are assured that this isn't played much any more, possibly because the secret of making the boots is dying out.

