You never know what you're going to get at Founders' open mic night...

Last night Joey Belladonna, the vocalist from Anthrax, stopped by the brewery and performed!

Anthrax was in town with Slayer, Testament, Lamb of God, and Napalm Death, for a show at Van Andel Arena Tuesday night.

Joey takes the stage at about the 6:20 mark in the video posted to Founders' Facebook page and launches into Journey's "Separate Ways".

He's got music playing from his phone that's hooked up to the sound system and at one point jokes, "Hope I don't get a phone call!"

The crowd chants, "One more song!", and Joey obliges with another Journey jam, "When the Lights Go Down".

Pretty jealous of all the people at Founders who happened to catch the lead singer from Anthrax at open mic night!