The best moment in sports fandom is rubbing your team's victory in the face of your rivals. The worst moment is rubbing your team's presumed victory in the face of your rivals, right before your team loses.
Such was the situation with this dancing Steelers fan, who began celebrating right before Kansas City missed a potential game-winning field goal over San Diego that would've sent Pittsburgh into the postseason. The Chargers went on to win in overtime, taking what would have been the Steelers' spot. The rooting interests of the rest of the group are unclear, though it's likely they were just rooting against the Steelers fan. They do not let him off easy.
This has been another episode of "when keeping it troll goes wrong."