It's not quite as dangerous as butt dialing, but cat typing can have its scary moments, like when PayPal or your IM client are open and in front.
So I am intrigued by a software utility called Pawsense, which detects when a cat is walking on your keyboard and shuts down key input within a couple of strokes. OK, while the odds are astronomical, your cat could randomly walk-type a vile obscenity into a memo you're writing while you are up getting a cup of coffee. You come back to the computer, fail to proof the thing, send it to your team and boss--voila, instant mortification. Your cat just sits there, grooming her face.
Pawsense also uses your PC speakers to emit a loud sound that cats hate (which pretty much assures me that this utility was not written by a cat lover).
I can't tell you how well it works because the publisher has the unpleasant policy of not offering a trial download version.