If you’ve never gone to see a show on Halloween, you’re missing out. Touring bands use October 31 as an excuse to get a little wacky and wild onstage, from costumes to unexpected song choices. Substream photographer Jim Trocchio got in the pit for New Found Glory and Yellowcard’s Halloween show at the Sands Bethlehem Event Center in Bethlehem, Pennsylvania, and not only did he spot opening act Tigers Jaw cosplaying as the cast of The X-Files, he also managed to capture a surprise fourth band—Metallica. (Sort of.) Click on for photographic evidence, if you dare.