Dave Grohl has opened up on the time he found his mum, Virginia, necking beers with Green Day.The Foo Fighters frontman was co-hosting The Tonight Show Starring Jimmy Fallon on Monday (May 24) to promote his new TV series From Cradle To Stage.The series sees Grohl teaming up with Virginia to explore the close bond between famous musicians and their mothers, with appearances from the likes of Imagine Dragons‘ Dan Reynolds and his mother, Christine Reynolds and Pharrell and his mum, Dr.