Mackie regaled, “So I [tell Dwayne Johnson], 'I just signed onto 'Pain & Gain.’ He's like, 'Oh, good for you.' [...] and I was like, 'Yeah, I'm hitting the gym, kid. I'm going to be bigger than you when I show up to set, so get ready.' And he goes, 'All right, man, good luck with that.' I'm like, 'I'm going to give this dude the business!'"