Coherence

During a dinner among friends, a comet passes over Earth and reality begins to unravel. The house at the end of the street is exactly like theirs. James Ward Byrkit shoots this science fiction thriller handheld and on a minimal budget, unfolding almost in real time, with actors who improvised much of the dialogue. Disturbing, intelligent, and impossible to predict: auteur science fiction that works perfectly.

Shot in 5 days with $50,000 and turns out better than 90% of big-budget sci-fi films. Masterful.