[4] Lou Taylor Pucci stars in writer/director Mike Mills’ adaptation of Walter Kirn’s novel about a nervous high school student afflicted with thumbsucking. Once he’s prescribed ritalin, Pucci’s character starts to feel more confident. Unfortunately, the drug also turns him into an asshole. If Thumbsucker focused more on the angle of drug abuse, it might better distinguish itself from the myriad of other quirky indie …