I always just assumed that things were incredibly easy for Dave Grohl. After seeing this trailer it makes me think otherwise and sure tweaks my interest to want to see the documentary.Here comes the 'Good news, bad news' routine though. The good news is the concert that follows Back and Forth is now going to be in 3-D. The bad news is the closest places to see this are NY or Brooklyn. Click here for a complete list of showings.