Alison Maclean's adaptation of Denis Johnson's story collection Jesus' Son has most of the obligatory drug movie elements, including junkie romance, moments of pop-scored euphoria, occasional hallucinations and vomitous seizures, pathetic overdoses, and pseudo-radical non-linear storytelling, but keeps its head above water with winning performances and by staying clear of the heavy stuff, i.e., a Moral or a Plot. Billy Crudup is super as druggie drifter F.H. (for "Fuckhead")--no poster-boy posing or tortured-soul Acting , just limitless goofy grace. Samantha Morton takes no prisoners as the under-written love interest, and Jack Black is hilarious as Crudup's most crazed drug-buddy. If Black supplants Philip Seymour Hoffman in the coming months as the chubby-dynamo-in-every-other-movie, it will be this role that we have to thank for it. The movie unfortunately perpetuates the epidemic of gratuitous voiceovers that seems to infect every filmic novel adaptation (as recently diagnosed in The Virgin Suicides), and its stop-and-start storytelling are similarly overfamiliar, but one scene after another delivers some kind of surprise just from Crudup's infectious interactions with his fellow losers.