Bullet Bill

From Mario Kart Racing Wiki

Bullet Bill
Description:	Is an item which hits all the karts who were in the way
First Appearance:	Mario Kart DS

In the games Mario Kart DS & Mario Kart Wii, the player can collect Bullet Bills as items. Upon using the item, the user will transform into a near (if not completely) invincible Bullet Bill and rocket down the track on Auto-Pilot for a few seconds, knocking over any enemies and players in the way and stripping players of their items, similar to the Chain Chomp from Mario Kart: Double Dash!!. The Bullet Bill can only be received by the drivers on 6th-8th place (6th-12th in the case of Mario Kart Wii ). However, this item can sometimes be a curse. When on the trickier, narrower courses, these can sometimes lead racers up to a sharp turn or obstacle on the track and then end, possibly causing the kart to fall off the track and lose some of the spots gained using that item. Players can avoid this item if they are far ahead of the person using it, invincible, or out of the flight path. This is also one of four items which can be used to dodge a Blue Shell (the others being a Mushroom, a Starman, and Mario Kart Wii's Mega Mushroom).

Bullet Bills also appear as obstacles on the Airship Fortress track.