A clip of the incident went viral on social media after one Saints fan and one Jaguars fan began fighting in the concourses of Caesars Superdome, New Orleans.
NFL fans are already unleashing mid-season levels of frustration on one another ... 'cause a Jacksonville Jaguars stan and a New Orleans Saints supporter went at it at the Caesars Superdome.
A Justin Bieber impersonator landed in hot water over the weekend after he tricked the staff at a Las Vegas hotel into believing he was actually The Biebs -- and ended up performing onstage in front of a packed crowd ... TMZ has learned.