Lightning

Thunderbolts are attack items found in the Mario Kart and Paper Mario series. These special items summon lightning from the sky, causing various effects. Thunder may be Luigis version of fire, however Luigi is shown to use green fire as well as orange to, disproving the theories.

Mario Kart
In the Mario Kart series, Thunderbolts are extremely powerful items that racers usually receive when they are in (or near) last position in a race. When used, a Thunderbolt will temporarily shrink all the other racers, making them slower and weaker.

In Mario Kart: Double Dash!! it will not affect you if you are currenty indisposed. (hit by another item) In Mario Kart DS, players will revert to normal starting with the closest to the person who used it to the furthest away.

Paper Mario series
In the Paper Mario series, the attack item is known as a Thunder Bolt. This item summons a bolt of lightning that inflicts five damage to one enemy.

Also in the series is the much more powerful Thunder Rage. This item summons a lighting storm that inflicts five damage to all enemies.

In Paper Mario: The Thousand-Year Door, the Thunder Rage can also be cooked by mixing a Shooting Star and a Point Swap (though not the best deal).