"Anything with Dirty makes me very nervous," says promoter Chang Weisberg early in Denis Henry Hennelly and Casey Suchan's rough-edged, fly-on-the-wall documentary about Chang's 2004 efforts to reunite the Wu-Tang Clan who hadn't performed as a group in nearly 10 years for a marathon hip-hop event called "Rock the Bells." And by the time the Clan finally takes the stage, deeply troubled crowd-pleaser Ol' Dirty Bastard has worked Chang's last nerve. It's not fair to say that the movie is all about
trying to coax a cracked-up O.D.B. out of his hotel room, but Dirty and his posse notably a pair of foulmouthed, belligerent buffoons called Budd...