A wild brawl broke out among a group of swimsuit-clad boaters at a Florida lake over the weekend — in which one man was knocked unconscious and left floating face down in the water, shocking video shows. The unruly fight happened at Lake Winterset in Polk County, in front of young children relaxing on the lakeside with their families, the Polk County Sheriff’s Office said. Seven men and a 17-year-old boy were arrested, Sheriff Grady Judd announced Tuesday, as he vowed to make an example out of the hooligans.