Fans of opposing teams fighting each other in the stands during NFL games isn't uncommon.
Fans of the same team fighting one another? That's a bit less common -- but it happened during the Pittsburgh Steelers' game vs. the visiting Los Angeles Chargers on Sunday night.
A fan captured this video of Steelers fans turning on each other during the game in Pittsburgh. One fan landed a nasty-looking headbutt on another. Security eventually arrived as other fans began to get involved.
Let’s Go Steelers!! pic.twitter.com/nvsMVgNVCR
— Kate🌻 (@katebrendel) December 3, 2018
To add insult to injury, the Steelers fell to the Chargers 33-30 on a last-second field goal.