Duff McKagan came out with a memoir earlier this month titled 'It's So Easy: And Other Lies,' and the former
Guns N’ Roses rocker held a book signing Friday in his hometown of Seattle to celebrate. Only things didn't go quite as expected when a man interrupted the event to heckle Duff about the last days of Kurt Cobain. Oddly enough, Duff is widely considered to be one of the last known people to see the Nirvana frontman alive.

When Cobain escaped a Los Angles rehab center back in spring of 1994 and boarded a plane headed to Seattle, he found himself sitting in first class next to McKagan. Duff recently explained: "We talked. We were both sort of in the same boat. A couple guys recognizing where each other was at. It's no fun being that completely and utterly addicted."

The plane landed and the two rock stars went their separate ways. Just a few days later, on April 8, Cobain's body was found in his Seattle home. Cobain had killed himself with a self-inflicted gunshot wound.

It was that coincidental meeting on the plane that became the focus of the heckler at McKagan's book signing. "Was Kurt Cobain depressed on the airline," the man can be heard saying loudly over the crowd. "Was he in depair?" The man continues to harass Duff with questions about Kurt until a security guard confronts and begins to escort him out of the room. At that point, the heckler yells out, "get your hands off me before I knock your ass down, motherf-----."

That got Duff's attention -- he had had enough. Duff jumps up from his seat and yells, "Get the f--- outta here, motherf-----!" to raucous cheers from the assembled crowd, walking across the stage in the direction of the heckler while doing so. As the man is taken out of the room, Duff sits back down in his chair and the signing goes on as if nothing had happened.

The altercation was capture on some very shaky and lopsided amateur video. Check it out below.

Duff McKagan Kicks Out Heckler From Book Signing