For obvious reasons, Foo Fighters frontman and former Nirvana drummer Dave Grohl was extremely close to Kurt Cobain – so much so that he said he was "terrified" when he stumbled upon the documentary Montage of Heck while channel surfing.

According to an interview with the Washington Post, Grohl had tried to avoid seeing the movie out of fear it would hit him too hard. “All the footage of him as a child, I think that might make me sad," he said. "And then the dark stuff at the end I think would bum me out,” He said he was only able to watch for about 10 minutes of the movie.

Grohl was interviewed to appear in Montage of Heck, but director Brett Morgen said he decided not to include any of that footage because he felt Grohl's fame might be distracting. Morgen told the Pulse of Radio (via Blabbermouth):

What I've done and started doing is turning on people and going, "Well, what is it you want him to say? Is there something you feel we're missing about Kurt?" And there never is an answer. No, we feel like we've just got to know Kurt better than we ever have, so why in the world do you want Dave? "Because he's famous." And that's exactly why he shouldn't be in the movie.

Of course, not everyone close to Cobain believes Montage of Heck provides all that accurate of a portrayal of the iconic musician. Melvins frontman Buzz Osborne – one of Cobain's closest friends who is featured during a recorded phone call in the movie – says he watched Montage of Heck a couple times and decided that "90 percent of it is total bulls--t."

'Kurt Cobain: Montage of Heck' (Official Trailer)