"I'm gonna go back stage for a second, I'm gonna vomit, I'm gonna drink a beer and I'm gonna come back out and play three more songs." And that's how Kings of Leon frontman Caleb Followill cut short their Friday appearance in Dallas just halfway through their set, leading his band members/kin to apologize profusely to the crowd (video of the apology here). Was he drunk? He claimed not, saying it was the extreme heat at the Gexa Energy Pavilion — where apparently very little energy is expended on air conditioning — that shot his voice. But tweets from the other guys in the band told a different story, including one from Caleb's brother, bassist Jared Followhill, that read: "Dallas, I cannot begin to tell you how sorry I am. There are internal sicknesses & problems that have needed to be addressed. No words."