What the fuck? First Bloodbath, and now this? Last night, November 3rd during the San Francisco stop of their current tour with Mastodon, the Dillinger Escape Plan invited previous collaborater Mike Patton up on stage to sing "When Good Dogs Do Bad Things" off of their Irony Is A Dead Scene EP, on which Patton contributed vocals. Obviously Patton lives in the area and just hopped on stage to have some fun. And, I'm jealous. Of course, you may recall that Dillinger guitarist Ben Weinman recently revealed that he and Patton are working on a new side-project together, so perhaps that was something they discussed around this show as well. For more Mastodon/Dillinger dates, click here.