If you’re a “Drive Thru Metal” fan you no doubt know all about Mac Sabbath, the band that mashes burger chain MacDonald’s with Black Sabbath for their own hilarious take on Sabbath tunes turning ‘Paranoid’ into ‘Pair of Buns’ and ‘Iron Man’ into ‘Frying Pan’ to lampoon the fast food industry.

Recently, Jack Osbourne took dad Ozzy on a surprise visit to see the band perform and Ozzy’s reaction was pure delight! I cued up the video above to the band’s performance, but you can back it up to see the entire scene shot for “Ozzy & Jack’s World Detour.”