I'm really mildly freaked out by these adverts for something you plug in the wall to make your cat more calm and well-adjusted. They started out as Bonfire Night things, but now they're all-year-round behaviour-modification devices. There's just something really totally wrong about the idea, and if I ever own pets, I'll make a point of not buying the things.
Not that I'm going to buy them now because I haven't got pets, you understand. That would be silly, and besides, they probably affect humans too and gradually kill your brain. It's a conspiracy.