And THAT guy's name is Matthew Glidden (@MatthewGlidden on twitter). He is, no joke, the STAR PERFORMER of Improv Boston Rock Band Night. Even on the slower nights, Glidden and his lady Sunny show up and almost always blow the doors off.
To answer your question about what he planned to do to Vinny - rub his junk on him. He did it. It was awesome.
The man on the left's name is Ali (@DemAli on Twitter), and he's an Improv Boston Rock Band Night regular. To give you some context about how crazy we know this guy is about this stuff, he was sadly waiting in the lobby because he didn't get a ticket, but everyone knew how crazy he was, so we snuck him in. No joke; within 2 minutes of being in the theater, his shirt was off and he was on stage. Dude's a maniac.