Dawn of the Dead. Definately.
My brother and I used to watch this over and over again from behind a big bowl of carmel popcorn.
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"Dawn of the Dead's plot is so effectively simple, and now thoroughly familiar, that it almost goes without description. While the world approaches a still unexplained and ever growing zombie apocalypse, four individuals-two millitary men, a helicopter pilot, and his TV reporter girlfriend-barricade themselves in an abandoned suburban shopping mall. The mall provides fodder not only for the film's well known social commentary, but also for some truly thrilling-if not terrifying-setpieces.
With its graphic depictions of human evisceration, exploding heads, and gruesome flesh eating, Dawn of the Dead may well be the goriest American film of all time. The film is actually so violent and gruesome that it was released unrated in the United States for fear of being slapped with an X Rating. That didn't stop the film from being a huge hit at home and abroad. The film earned rave reviews from critics (most famously, from Roger Ebert, who called it `one of the best horror movies of all time'). It instantly became recognized not only as a genre classic, but also as one of the sharpest social satires of the decade, with its often hilarious commentary on an ever growing consumer culture embodied by the film's mall location."