RIVALRY RUMBLE
Two fans at the Cowboys vs. Eagles game got into a wild brawl ... and things turned so violent during the fight, the combatants almost destroyed thousands of dollars worth of memorabilia.
The scrap went down during the Cowboys' win over Philadelphia ... when a man wearing a Raiders Michael Crabtree jersey got into it with a Dallas fan.
It's unclear what started it all ... but video from the scene shows the two were throwing some serious haymakers at each other -- before they spilled into a pop-up shop full of rare, signed jerseys, photos and more.