Zakk Wylde was in a Singapore prison today (December 1).

But fear not, he was only there to play for the inmates of Changi Prison, and also to do a special question and answer session. The former Ozzy guitarist did a half-hour set for 40 prisoners, declaring: “It seemed like the right thing to do, since my first gig with Ozzy was in a prison [1987 at Wormwood Scrubs].”

Watch a video of Zakk talking about the event below.