Neighbours can fall out for a host of different reasons - whether it's someone playing music too loud or who should pay to cut down a huge tree right on the boundary between gardens.
Meanwhile, one woman has found herself at war with her neighbour over quite possible the most petty reason we've ever heard - a doormat.
Every morning, when Taylor Stanfill leaves her apartment, she finds that her doormat has been kicked away, presumably for being too close to her neighbour's mat, despite the fact they never actually touch.