We were doing this road trip to Vegas and [David Ayers] was just [occasionally] filming. We spent five hours in the car so there were plenty of times when it was just the three of us talking. Then that song came on Jake’s iPod and we just started singing and David very stealthily brought out his camera … It’s not like he asked us to play that song again and do it again, it just happened, he filmed it, and now it’s in the movie. And luckily they could clear that song. The music supervisor was sweating it for a second.