A Denver Broncos fan got badly knocked down at the team's preseason game after getting himself in a stir up, as shown in viral footage shared on social media, Sunday.

The wrangle broke out at some point during the Broncos' 38-12 home win over the Arizona Cardinals when a guy holding a Coors Light tall boy started beefing with another supporter.

During their exchange, the guy with the beer faked a move to scare his foe... only to find himself at the receiving end of a nasty punch to the face, as his opponent was dead serious when it came to actually fighting.