Basketball has PIG, skiing has SLVSH, and mountain biking has MTB. The sport may change, but some universal principles remain true across all tit-for-tat games: More skilled competitors make for a more interesting game, knowledge of an opponent's background can be used to dastardly effect, and the pressure of head-to-head competition can make people try things they wouldn't ordinarily attempt.
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This game of MTB between professional rider Eric Porter and popular Youtuber Seth (of Seth's Bike Hacks) perfectly exemplifies the aforementioned principles, pitting the two skilled friends against each other in a scenario that encourages "playin' dirty."