Michael Buble poses as a fan crashing Foo Fighters’ festival set in hilarious gag

Michael Buble steps up to the mic during Foo Fighters' concert and began singing the first verse of his song. Photo: TNS/AP

Dave Grohl was the ultimate pretender last weekend while acting like he didn’t know Michael Buble was going to join him onstage during Foo Fighters’ Outside Lands set.

Buble made a surprise cameo Saturday (Aug 12) during the rock band’s show at the San Francisco music festival as part of a long-running gag involving his 2009 single, Haven’t Met You Yet.