Dustcats are generally rather cute entities, prone to floating about and slurping up dust. If a single dustcat feels threatened, it may spew dust at you. Unpleasant for most people, fatal for anyone with serious allergies.
On rare occasions when a large number of dustcats all feel put out, threatened, offended or enraged at the same time, they form a wrecking ball. All the soft bits go in the middle, all the pointy bits on the outside. It looks something like this…
The Hopeless Vendetta 