Dave Grohl can't get used to performing in stadiums.
The Foo Fighters frontman is still stunned by the popularity of his band and admits he had a "freaked-out breakdown" when they performed to a huge crowd at London's Wembley stadium in 2008 because he couldn't believe the size of the crowd.
Recalling a moment in the show where he stopped playing, which is documented in a new film about the group, he said: "That was an honest, freaked-out emotional breakdown.
"(Drummer) Taylor Hawkins and I play off each other live and at that point he wasn't sure what was going on. But I'd been terrified every night for six months before those shows. I mean, 85,000 f***ing people!
"We'll never get used to playing stadiums. We've weathered some pretty questionable music and style changes over the years, and there's always a worry that people will forget about us."
Dave also admitted he insisted on seeing the group's film, 'Foo Fighters: Back and Forth' - which chronicles their 16-year career - before the rest of the band because he worried it could cause problems with their friendships.
He said: "I didn't want it to become a problem. I wanted it to be a good thing, but it was totally cool.
"Watching it, I saw that each person in the band had an uncomfortable moment, me included. Everyone did and I thought it was good because it means we're getting to the truth."