A recent Appalachian State football practice descended into chaos ... as a player ripped off his teammate's helmet and then beat him with it -- and the entire ordeal was caught on video.
Check it out ... footage from an App State summer workout posted online shows the team in an 11-on-11 play -- when a pass rusher in a black No. 12 jersey gets into it with a blocker in a white No. 73 uniform.
You can see the two get in a bit of a shoving match .