The 2015 Mayhem Festival will be wrapping up in a few weeks, but the talk of the festival so far has been the performances by King Diamond and Slayer. Both iconic groups have been putting a show for audiences across the nation, and last night they had a little surprise for the fans at PNC Bank Arts Center in New Jersey. During King Diamond‘s set, Kerry King stepped out on stage to perform Mercyful Fate‘s “Evil” with the legends, and the place exploded! For the first time ever, the two Kings shared the stage, and it was a moment fans in New Jersey will never forget! Luckily for those us not able to see the set, you can watch fan footage of the historic performance below!