Who has the energy to fight in freezing cold temperatures?
Raiders and Chiefs fans.
A bunch of rival fans started brawling in the stands at Arrowhead Stadium in Kansas City Thursday night -- with people getting thrown down the bleachers ... it's gnarly.
Eventually cops responded and broke the whole thing up ... but not before some of the pugilists took some heavy shots to the face.
No word if any arrests were made. We're working on it.
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