Thumbsucker (2005)

Starring: Tilda Swinton, Vincent D'Onofrio, Keanu Reeves, Lou Pucci. As if growing up in nondescript Middle America wasn't enough of a bitch, Lou Pucci's Justin Cobb still sucks his thumb, has a 'spiritual' dentist (Keanu, natch) who won't reveal his 'spirit animal'... And gets put on Ritalin.

This despite his celebrity-obsessed mum / stone statue of a dad seeming to have even less grip on realiy than either himself and his textbook little shit of a brother.

Thumbsucker is understated, dark and very funny.

Keanu is still rubbish though.