Some nights are better than others. For example, some nights you flip on the TV and wouldn't you know it, right there glancing back at you from the screen is none other than fun. That's what happened last night (Aug. 21) when the New York indie rockers took the stage of 'The Tonight Show with Jay Leno' and rocked out the title track and second single off their latest full-length album, 'Some Nights.' The tune follows hotly on the heels of 'We Are Young,' fun.'s breakout hit and easily one of the biggest songs of 2012.