I cannot mention Quarantine without mentioning its Spanish predecessor [•REC] – it’s a great film and if you haven’t seen it, consider giving it a try! Fabulous!
[•REC] turns on a young TV reporter and her cameraman who cover the night shift at the local fire station. Receiving a call from an old lady trapped in her house, they reach her building to hear horrifying screams — which begin a long nightmare and a uniquely dramatic TV report.
My Rating: A
Interesting Fact: During the filming of the scene where the young fireman falls from the stairs, not a single actor knew that was going to happen, so the reactions we see on the films were the real reactions of the actors themselves.
Honourable Mentions for the letter R: The Resident Evil Franchise, Re-Animator, Return of the Living Dead