Though we can all appreciate the joy of brainless, undemanding movies which let us unwind after a tough day at work, the virtue of an intelligent, challenging film also speaks for itself.
Yet there's certainly nothing surprising about, say, a David Lynch film tying audiences up in mental knots, or Christopher Nolan's Inception forcing audiences to pay close attention to its dream-hopping mechanics.
There are, however, movies which present themselves to audiences as relatively straightforward genre affairs, yet which for one reason or another, are deceptively complicated and, yes, ultimately quite confusing.
These 10 films, whether for better or more often for worse, left audiences quite unsure of what they'd just seen, scrambling to figure out the plot, the character motivations, and any potential deeper meaning.
In some cases that was clearly the filmmaker's intent, to get the audience asking questions, but in others an exciting movie premise was simply destroyed by poor writing and direction, turning dishy concepts into mentally exhausting, scarcely coherent cinematic gunk.
Whether you "got" these movies or not, they were miles away from what most viewers expected going in...