it's an alien control device. basically they abduct certain people they want to experiment on and they implant these control devices and then by the power of radio signals they are able to make u walk n talk and put yr hands around someone's throat and squeeze until they are dead, and then they release the control and u r free again..
well, that's what i told the court but the judge wud not believe me and he sent me down for a murder when it was not my fault. please sign a petition to get me out or yr granny will end up locked away and in the same situation and no-one will believe her either!!