Rain Cloud

The Rain Cloud is an item that appears in Mario Kart Arcade GP and its sequels, Mario Kart Arcade GP 2 and Mario Kart Arcade GP DX. When used, a cloud will appear above the opponent's head and make the kart harder to control. The item is unlocked sometimes by winning the Mario Highway race in Grand Prix mode for the first time.

Trivia

 * A similar acting item called the Storm Cloud appears in  (a successor to Mario Kart Arcade GP focusing solely on the Pac-Man brand and other properties) hovering over opponents and making it harder for them to be controlled; this was likely inspired by the Rain Cloud and other cloud items in Mario Kart Arcade GP.