Chip on his Shoulder

Comes from when people spent more time around animals specifically horses. It refers to when someone refuses to do what they are told because the person in charge is incompetent.

A horse was refusing to do what it was told so a veterinarian was called in. The veterinarian examined the horse and noticed a chip of flesh was removed from the front shoulder of the animals leg (chip on his shoulder). As it turned out when the owner was drunk he walked the horse into the side of the barn door. Now the horse refuses to obey.

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