The Wizard Of Oz (1939)
The WTF Movie: Blunted by familiarity, maybe, but consider that this is a film about a tornado whisking a girl to a world populated by witches and Munchkins, where her best friends are a scarecrow, a tin man and a talking lion. At the very least, it's a 'What The Heck?' movie.
Drop Your Popcorn Moment: The Wicked Witch of the West sends her army after Dorothy. An army of FLYING MONKEYS.
The WTF Movie: What do you need to raid a man's dreams? According to Christopher Nolan's blockbuster mind-fuck, you need an architect, a chemist, a forger and, of course, a dreamer.
Drop Your Popcorn Moment: Dominick Cobb (Leonardo DiCaprio) shows budding architect Ariadne (Ellen Page) the power of dreams by folding a city skyline in on itself.
Spirited Away (2001)
The WTF Movie: Hayao Miyazaki's fantasy goes through the looking glass into a world where parents are turned into pigs and a witch runs a bathhouse for the spirit world.
Drop Your Popcorn Moment: The bathhouse is invaded by a gigantic stink spirit.
The Thing (1982)
The WTF Movie: Studios hoping for a hit were as freaked out as audiences when John Carpenter pushed the limits of SFX to reveal what 'alien' truly meant.
Drop Your Popcorn Moment: An attempted defibrillation goes awry when the patient's stomach bites the doctor's hands off and its head sprouts legs and scuttles away.
The WTF Movie: Shane Carruth's brain-teaser depicts time travel the way it probably would be in real-life: discovered by accident, boring to actually do and absolutely mind-boggling.
Drop Your Popcorn Moment: At whatever point you need to hands to scratch your head in incomprehension.
Being John Malkovich (1999)
The WTF Movie: A puppeteer (John Cusack) gets a job on the seventh-and-a-half floor of a skyscraper, where he discovers a portal into the head of actor John Malkovich. Honestly, we're not making this up.
Drop Your Popcorn Moment: Malkovich enters his own head and discovers that everybody, regardless of race, age or gender, is John Malkovich.
The WTF Movie: David Cronenberg tackles the thorny issue of video nasties as porn-merchant James Woods discovers there's more to his latest acquisition - S&M channel Videodrome - than meets the eye.
Drop Your Popcorn Moment: Woods develops a vaginal-like wound in his stomach, through which his enemies insert videotapes to brainwash him.
Un Chien Andalou (1929)
The WTF Movie: Luis Bunuel and Salvador Dali lay the framework for all future WTF movies in twenty minutes of freeform, taboo-trashing surrealism.
Drop Your Popcorn Moment: The eye slicing, of course. Even knowing that it's really a dead calf's eyeball doesn't make it any easier to watch.
2001: A Space Odyssey (1968)
The WTF Movie: History according to Stanley Kubrick - black monoliths teach apes to kill, computers to go mad and humans to turn into giant space babies.
Drop Your Popcorn Moment: Astronaut Dave Bowman (Keir Dullea) goes 'beyond the infinite' into a kaleidoscopic tunnel of light and otherworldly noise.
The WTF Movie: A man, his monster baby and the lady in the radiator - while Hollywood messes around with horses' heads, David Lynch perfects the art of messing with our heads.
Drop Your Popcorn Moment: A taste of things to come as Henry (Jack Nance) tries to carve a roast chicken and it writhes and bleeds on the plate.