Thunder Cloud
The Thunder Cloud (also called Lightning Cloud) is an item from the Mario Kart series, appearing in Mario Kart Arcade GP, Mario Kart Arcade GP 2[1] and Mario Kart Wii. Unlike other items, it activates itself automatically when obtained from an Item Box.
When obtained, the player automatically receives a boost of speed, constantly. However, the Thunder Cloud will eventually strike Lightning at the player, just shrinking them. The Cloud however can be passed on to another kart by bumping into any other racer before the lightning strikes. To use the item efficiently, racers will have to bump another player and let him/her be shrunk instead, while still having kept it long enough to fully benefit from the speed boost it gives.
Trivia
The Thunder Cloud is possibly the cloud of Lakithunder, a Lakitu boss from the game New Super Mario Bros.
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