Foo Fighters frontman and former Nirvana drummer Dave Grohl apparently doesn't like fighting, at least not during one of his shows.  When a fight broke out in the crowd during the Foos' set at the iTunes Festival in London Monday, Grohl stopped the show to point out and berate the man who had started the ruckus.  "Get the f--k out of my show, right now," Grohl screamed.  "You don't come to my show and fight -- you come to my show and f--cking dance, you a--hole," he continued as security escorted the man out.  Check out some fan-filmed footage of the incident below.