Nothing says "Star Trek: The Original Series" like a space vixen wearing some kind of campy outfit. And so we see a certain retro sci-fi vibe in the Necomimi headset from Neurowear. Put the apparatus on your noggin with the sensor pressed against your forehead, and the system will read your brain waves, sending visual cues straight to the cat ears. According to Neurowear, when you're concentrating or stressed, the ears will perk up, and when you're in a state of relaxation, the ears will lie down—mimicking a cat's behavior. You'll also attract a lot of stares from strangers. Because wearing furry cat ears in public is annoying.