Defacer

Audio Assault’s Defacer is the most metal plug-in you’re likely to find, both in name and function. It’s basically a distortion effect, but one that totally mangles any incoming audio as opposed to just making it rough around the edges, and with a few twists of the knobs you can add pretty much any sound and be given a tinnitus-inducing blast of noise. When you need to make some noise but nothing else is quite cutting it, Defacer is one to try.

http://audio-assault.com/downloads.html