The gun, and a launched dog.
The AMN machine gun is a modified machine gun in the AMN mod. It is blue, and always has a cat attached to the end. Right clicking changes the type of projecting the gun fires. Every single bullet launched is replaced by either a dog, a Gary Coleman, or an elephant which instantly kills any living being that it makes contact with. The dog, Gary, and elephant are color-coded by a white, cow-like, and black cat respectively. The launched being also bounces around for a while before exploding. The elephant might be too large to fit in certain places, and simply will not spawn.