We came in today with a chip on our shoulder to prove who we are.

He came in not with a chip on his shoulder, but with something to prove.

I've been playing all four years with a chip on my shoulder. I just want to prove everybody wrong.

He came in with a chip on his shoulder. He's got something to prove. They did a good job picking him. They stole one. He's got borderline cockiness, but he's got enough humbleness where you don't think he's arrogant.

A chip on his shoulder

I really had a chip on my shoulder, ... and it still comes out every now and then.