Jack Osbourne and his daughter jumped on the crazy train to honor Ozzy Osbourne.

Over a year after the Black Sabbath rocker died at the age of 76, the 40-year-old and his daughter Pearl, 14, went undercover at Universal Halloween Horror Nights, scaring fans at the Ozzy Osbourne: Prince of Darkness haunted maze at Universal Studios Hollywood.

“I’m Jack, and this is my daughter Pearl,” Jack shared in a joint Instagram video with Hollywood Horror Nights Oct. 3. “We are getting geared up, and we’re going to be a Prince of Darkness minion in my dad’s maze.”

“It was a promise I made to Pearl,” he continued, “from the moment I said we were doing this [haunted house], fulfilling it.”

As shown in the footage, the former reality star—who shares Pearl with ex-wife Lisa Stelly—and the teen were transformed into bloody, bat hybrid creatures, wearing priest costumes, scary makeup and horrifying masks.