The Twist: Take the idea humans use 10% of their brain. Now, what would happen if they used more? Telekinesis, phone-tapping and involuntary teetotalism is the answer Lucy posits. As the film ramps to its climax, so does the eponymous heroine's brain capacity, with the final minutes seeing her hit the much lauded 100%. She becomes a massive supercomputer, leaves the confines of time and space, and then becomes ethereal (exactly like Samantha in Her), although not before giving Morgan Freeman a USB stick of "knowledge". Why It's So Dumb: Lucy's science is dumb. That should be obvious, although as this movie based on a ridiculous urban legend was made by a director who in interviews insisted he subscribed to its central idea, it probably still needs to be stated. Its twist, however, is something else. There's a level of self-imposed importance to Lucy travelling backwards in time to the dawn of man that works against the grain of a definite popcorn treat. This is supposed to be a Léon-inflected action film that serves as a proto-Black Widow movie, not a The Tree Of Life-style meditation on humanity. Unbelievably, the jumps back to creation make even less sense here than they did in Mallick's opus.
