The technique, which is already being used in hearing aids, headphones and in Google Glass, allows a person to “hear” something inside their head without it being audible to anyone else, according to a Telegraph UK report.

Sky Deutschland and BBDO Germany ad agency reportedly explained in a promotional video, “Tired commuters often rest their heads against windows. Suddenly a voice inside their head is talking to them. No one else can hear this message."

If approved, BBDO hopes to begin the state-of-the-art medium “as soon as possible.”

One can only imagine how this could be used without the best intentions in mind.

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