This plot summary of
Thumbsucker made me laugh:
Justin's hippie dentist may have hypnotized him out of his socially perilous thumbsucking habit, but he can't suppress the boy's "oral gift." Justin's mouth just won't quit: beer, decongestants, nitrous oxide, cough syrup, Midol, and Ritalin go in, and out spritzes hilarious commentary on his eccentric yet authentic life and times.
The part in quotation marks makes it sound like a porno.
Sasha