A Chip on Your ShoulderThis common phrase started with a literal dare to fight.

From the show

History of Phrases

Uncover the aggressive origin of a popular expression for holding a grudge. In the 19th century, American boys would place a wood chip on their shoulder, daring others to knock it off and start a brawl. This physical challenge evolved over time. Today, the phrase describes a psychological state: a belligerent attitude fueled by past grievances and a need to prove something.