you hear a voice in your head but you are sure you are not schizophrenic. İt's one of your braincells, a real loudmouth Waaaiit that can't happen! You are pushing the wall, why does it not mooove? receives a signal that a wall is stuck there and very heavy Ooooh İ get it now... sorry for the confusion this process happened in a VERY short time, quarter of a millisecond