And as he lay in bed with his wife recently, she flicked on to HBO which was showing the documentary. But after watching 10 minutes of it, he became "terrified" of what some of the darker footage might have done to his state of mind.

Grohl tells the Washington Post: "All the footage of him as a child, I think that might make me sad, and then the dark stuff at the end I think would bum me out." Read more - here.

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