While a professional massage therapist in a luxury spa can be a relaxing experience, many people will testify that the feeling delivered by a massage chair machine is almost beyond this world. Every day in Brookstone stores across the country, for example, people lay in ecstasy while mechanical massage chairs relieve tension and soothe aching muscles. It is almost spooky how blissful a robot can make you feel. Researchers proved in a 1999 scientific experiment that a robot can tickle a person. Inanimate objects can, in fact, cause a sensational feeling as can be seen in a YouTube video of a baby with a metal head massager.