Why Stop Now takes large themes much manhandled as movie cliches, and treats them with care and respect. It likes the characters. So did I.

It's well-acted, certainly, though these performances belong in a film with sharper pacing, one that breathes easily. But, this directorial debut from Phil Dorling and Ron Nyswaner breathes like a frequent smoker: in fits and starts, peppered with coughs and dry heaves.

Slips into the no-man's land between screwball and melodrama, squandering both the comic opportunities of an irrational search for drugs and the raw desperation of a piano prodigy who's held captive by his mother's dysfunction.

Acquires a little vigor and some fun from Tracy Morgan as a friendly drug dealer who lives with his mom.

Once Why Stop Now? has exhausted its bag of tricks, there is a screeching of brakes as it approaches the edge of the cliff. Having expended all that stamina, the film collapses from exhaustion and settles for an abrupt, feel-good ending that is as perfunctory as it is preposterous.