Here's everything you need to know about this eminently entertaining video, courtesy of the "big nature nerd/mountain man boss" himself, John Griffith:

Tonight brought us the season finale of Shaq Vs., a show in which Shaquille O'Neal issues challenges to celebrities. This time, it was O'Neal vs. tween sensation Justin Bieber. Video of their dance-off—and O'Neal rapping at Bieber's concert—inside.