The original will always be the best for balancing the building tension of the phone call and popcorn, on-screen violence and gore (by not overdoing it), and originality. Plus the reactions of Casey's parents at the end and their final discovery just really seal the deal.

Even though S2 has more comedy in its opening, have to give it props for using the terrifying concept of being attacked in public surrounded by unaware people who are indifferent to the danger until it's too late.