Place it right after the backwards turn in a Mario Kart edit, then follow the confusion with Okay Let's Go once the racer finally turns around, or cut to Ah Shit Here We Go Again when the mistake costs them the race.
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This is a 19-second burst of Poofesure yelling the question at Beef Boss while he drives backwards in Mario Kart Wii, his voice rising in disbelief as the race slips away. It feels frantic, funny and exasperated, like catching a friend making an obvious mistake in real time. The clip comes from that Mario Kart Wii moment, when Beef Boss kept reversing instead of racing forwards.