At the end of this acoustic song you can hear singer Kieran Shudall saying, "She texted me during that."
"I'd put my phone on the side for the song, which was a one-take thing," Shudall explained to the Independent laughing. "And my girlfriend - who the song is about - was texting me so my phone was vibrating through the whole thing and I was like 'why would you do this to me now?'"
"We kept it in there because it makes it a bit personal," he added. "I've always loved those Beatles records where you can hear Ringo shouting in the background and stuff. I think sometimes you want to make the listener feel like they're in the studio with you."
"Kickstart My Heart" is about all the ways Motley Crue gets their blood flowing without drugs. It was inspired by their bass player Nikki Sixx, who claimed he had to be revived with a shot of adrenaline to the heart after an overdose.