The epitome of an indie, low budget, single location film! The absolute mind-f@!# that, through largely impromptu dialogue and genuine reactions, makes you question who you are, and/or who you could have been, in multiple, alternate, fractured realities.
A round of applause for the Director, the Production team, and the actors who achieved this with $50K, in 5 nights, with 2 cameras, in 1 location.
A piece of advice: Instinctively, you will try to rationalize and keep track of what is happening. When you start feeling your brain cells frying, STOP!