About two years ago on a weeknight I arrived at DFW on the last Continental (IAH-DFW) flight circa 10:00pm. Full plane and since it was a weeknight most passengers were tired from a long day's work.
As I leave I heard a commotion in the middle of the plane. Apparently someone had taken their case out of the overhead bin and it had fallen on another passenger. Shoving match ensued. Both pax were hauled off by FA to security.
Wrong places for shoving matches therefore include in an airplane!