Montage of Heck, the first fully-authorized documentary about Kurt Cobain, features a lot of home videos of the Nirvana frontman as a child and towards the end of his life. It is that footage that makes Dave Grohl “terrified” to watch the film.

He tells The Washington Post, he was lying next to his wife when she came across Montage of Heck. The film had already started, and the former Nirvana drummer and current Foo Fighters frontman — figured he caught the one part of the film that he could watch.

“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,” Grohl says. After watching the film for 10 minutes, Grohl stopped and went to sleep.

Before Grohl joined Nirvana in 1990, he was the drummer for the punk band Scream. He was a member of Scream when a friend called him to say that Nirvana was looking for a new drummer, but Grohl was concerned about leaving his current band mates. That’s when he called his mum.

“Sometimes, you just have to do what’s good for you,” Grohl remembers his mum telling him.

Fans worried that surgery on Dave Grohl’s broken leg could force the cancellation of some, or most, of the tour. But Grohl took to the band’s Twitter page on Monday morning and wrote, “Can’t [bleeping] wait for the 4th!!! See you at home, DC.” The first show Saturday at RFK Stadium in Washington, D.C. is the biggest rock show of the U.S. summer, with opening sets by Heart, Joan Jett and the Blackhearts, Buddy Guy, Gary Clark Junior and more.

That tweet was followed up by a release from the Foos’ publicist stating that the tour was kicking off this weekend and listing all the dates through the fall.