Bump; noun: A light blow or a jolting collision; a protuberance on a level surface; verb: Knock or run into someone or something or meet by chance; move or travel with much jolting and jarring.
Knuckle; noun: A part of the finger at a joint where the bone is near the surface; verb: Rub or press (something, especially the eyes) with the knuckles.
Transfix; verb: (Usually transfixed) cause someone to become motionless with horror, wonder or
astonishment; pierce with a sharp implement or weapon.
Transfix on the sound
Of the bump
Makes one White knuckle