Grohl revealed during an appearance on Conan that he'd been stopped by police on his way to the show's LA studios for speeding and talking on his phone while driving.
California law bans drivers from holding a phone while behind the wheel.
'Times Like These' singer Grohl told host Conan O'Brien that the authorities were quite understanding, saying: "He let me off with a warning for the speeding but gave me the thing-a-ding (ticket) for talking on the phone."
Watch Dave Grohl's Conan interview below:
Foo Fighters are to join Arcade Fire and Mumford & Sons as headliners for Neil Young's annual Bridge School Benefit concert in October.
Last week, the controversial Westboro Baptist Church announced that they will picket Foo Fighters' upcoming Kansas City, KS concert.
> Foo Fighters shower naked in new tour video: Watch
Watch Foo Fighters' 'Arlandria' music video below: