The new album by Kings of Leon is "the most immature album ever made," according to bassist Jared Followill. Jared says the recording sessions for "Mechanical Bull" were full of pranks and practical jokes. Explaining the childish behaviour during their new sessions in Nashville, he told the Metro: "[There were] fake rats, gun caps popping everywhere. We basically goofed off the entire time." It's a dramatic change from their last album "Come Around Sundown," which was a particularly tense and sensitive era for the band. "There was definitely an internal struggle - you couldn’t even say 'radio airplay' without [singer] Caleb getting angry. We’d been called sell-outs after 'Sex On Fire.' He didn’t want people to think that was all we’d tried to do." His brother and guitarist Matthew added: "Making 'Come Around Sundown' was just not fun. We were in a tiny studio in New York, there was too much alcohol around all day - I’m just glad we made it back together." It's a marked change for the band which once felt invincible, but is learning to enjoy their career to make it sustainable, as drummer Nathan Followill describes: "When you’re young and cocky, older bands tell you: 'Take it easy, so you can have longevity.’ We were like: 'You’re just jealous of our work ethic and cos we can tour so long and party so hard.' Eventually, we realised we should take stock."