I already explained briefly about what this item is in the Items article, but I wanted to also share strategy for using the shock
Most Mario Kart racers refer to this as “the shock”.
It only be obtained in very low spots. There can be up to three shocks obtained at once. This item will hit every racer with a bolt of lightning that removes their items and scatters the items on the ground (the only items that can be dropped on the ground are triple green shells, triple red shells, triple mushrooms, triple bananas, and all the items in a crazy eight (however those items on their own cannot be dropped).
The shock also makes racers spin out and become small and slower. If you’re in a top spot, you’ll be small for much longer, whereas if you’re closer to last place, you’ll only be small for a few seconds. You can be squished by a racer that’s normal size while you’re small.
You can use these shocks strategically to make racers lose their items right after they drive through the item boxes or in a big shortcut where they’d need speed items.
You cannot hit yourself with the shock.
If you’re in a boo, bullet, or star, you will dodge, you can also fall off the track to dodge.
If you get shocked while you’re in a glider, you will stay in it and not lose any speed (until you land on the track, where you will move slower again).