7. 'Harry Potter and the Half-Blood Prince'
This brooding installment of the Harry Potter juggernaut (we're at film six of eight, for those who've lost track) sees Hogwarts classmates Harry (Daniel Radcliffe), Ron (Rupert Grint) and Hermione (Emma Watson) playing out something of a wizardly John Hughes film in terms of romance and teen angst love triangles.
Harry pines for Ron's little sister Ginny, Hermione pines for Ron, and Ron spends most of the movie making out with Lavender Brown. While all the unrequited love business is interesting, the real meat of the story involves Harry's used textbook that once belonged to a mysterious "half-blood prince," whose identity is unfortunate, least of all for Dumbledore. Sniff, sniff.