Round 1: Match 24
Psycho
Possibly the most iconic horror movie of all time, up there with Jaws or Night of the Living Dead. The music was tone-perfect, the mid-film twist was well done, and Anthony Perkins is top-notch, creating a twitchy, nervous little man that he would later perfect in Orson Welle's The Trial. Not the best horror movie ever, but very few are better.
VS
Super Size Me
Sure, if you eat nothing but McDonalds for a month, your health is gonna go to shit. This movie may not tell us anything any rational person wouldn't already know, but it seems pretty anti-McDonalds, and that's always a good thing. The selling point is that the guy in question seems pretty likeable, so the viewer can actually get behind him a little.