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The Laughter Bag is an item in Mario Kart Arcade GP, Mario Kart Arcade GP 2, and Mario Kart Arcade GP DX.
The Laughter Bag is a lock-on item. Upon hitting a racer, the Laughter Bag will slow the racer down slightly and then proceed to hover over the racer's head for approximately 7 seconds. If the racer is passed or hit by an item during this time, the Laughter Bag will taunt the racer by laughing at them.