Pandemonium erupted early Sunday in the lobby and bar of the Sheraton Society Hill when dozens of guests from two separate wedding parties clashed in a battle royal-like rumble. Cops clobbered several of the scrappers with billy clubs while trying to quell the violent outburst. One man was tasered, while another, one of the brides uncles, suffered a fatal heart attack on the sidewalk outside. NBC Philadelphia reports the melee was triggered by in-fighting among one party that spilled over to the other as they arrived at the hotel mid-brawl. Posted below is video of the spectacle, captured by a hotel guest who was not affiliated with either group.