“What we have here is a failure to communicate…”

Ever know someone with “a chip on their shoulder”?  One story has that phrase originating from the idea of two boys picking a fight with each other, the one putting a wood chip on his shoulder and daring the other to knock the chip off, thus initiating the knock-down-drag-out. 

The problem with chips on shoulders is that they tend to fall off on their own, starting fights when none were intended.  For example: