Technology ripe for abuse.

Kiss privacy inside your own head in public good-bye. I already find those displays that sense when someone is close and start up a spiel to be unusually annoying.

Of course, design something that effectively blocks such signals and make your own fortune.

O goody, spam brought inside your head! That is going to REALLY pi$$ me off. There is no way I would ever buy anything from some a$$hole who uses such in-your-face sales techniques as that. The seller obviously has no regard for their customers feelings at all.