F Foo Fighters frontman and former Nirvana drummer Dave Grohl surprised guests at a backyard bash in Los Angeles with an unexpected appearance. The event, which was held at a pal's house known for hosting backyard concerts, was viewed 586K times on social media and had been planned for years. Grohl, a 17-time Grammy winner, has long been known for his love of barbecue and has served hundreds of charitable meals for charity, including meals served at Hope the Mission shelters and firefighters battling California wildfires. The unexpected appearance comes after a turbulent year for Grohl's personal life, which saw him confessing to having a baby with another woman outside his marriage to Jordyn Blum.