Head massager or mind probe?

Having "thousands of tiny fingers simultaneously massaging your scalp" sounds unhygienic and somewhat frightening, but the Brain Spa Head Massager still might be a good way to unwind after a long day at work. The helmet is said to alleviate stress and tension and costs just $49.95. However, the site provides no explanation for how it works — and we can't be sure it's not an alien probe or brain sucker — so buyer beware.