Florida Panthers captain Willie Mitchell got tied up with Pittsburgh's Kris Letang, and inexplicably resorted to swinging Letang's own helmet at him. Willie Mitchell's a lawless man.
The officials either didn't see Mitchell's swing, or didn't care, because the Panthers defenseman didn't get anything more than the usual five-minute major for fighting. The league could hand down a fine or suspension, though.
The whole video's below. The helmet swing is at roughly the two-minute mark:
Also, please note the unhappy Penguins fan staring daggers at Mitchell: