PawSense is a computer program published by BitBoost Systems that can apparently 'senses' when a cat is strutting across your keyboard, and then blocks that input from the keyboard and makes noises intended to annoy the cat. Of course, it's been patented and there is no Linux or MacOS build. The software industry is filled with such unimaginable genius!
I almost bought this, but then remembered that this would mess up my dream of teaching my cats to do my job for me. Hey, you laugh, but it really isn't that much of a stretch for a creature that can flush a toilet.