My first zombie movie experience came when I was but a wee lad of 10 or so years. A classic, Night of the Living Dead , which I watched on a visit to my aunts and uncle in Philadelphia. It scared me shitless. Me and my sibs didn't want to go into the darkness up the stairs to brush our teeth afterward even.
I saw a Redbox at Walmart yesterday (which was blue, because it was in a Walmart. Go figure.) My eye immediately went to one of the New Releases: [REC] 2 . It's a sequel to [REC] . Both of these Spanish horror films have received high praise and (of course) spawned a Hollywood remake, entitled Quarantine  along with an original Hollywood sequel, Quarantine 2: Terminal . Sadly, I haven't had the chance to watch the originals and I've only seen the first Quarantine, but that one was great. Really!! I will admit that since I hadn't seen the Spanish version I didn't get to fire from the high ground (hehehe) but as a stand-alone film, I liked it.
Anyway, so seeing [REC] 2 made me think about how the things featured in the film aren't classic undead zombies, yet, that movie is undeniably a zombie film. I like to call these pseudo-zombies. A slew of recent films came to mind: I Am Legend , the 28 Days Later  series and the Resident Evil  series (those zombies were actually undead though). In all of these films the 'zombies' came to be due to a virus or some other product of genetic engineering. In contrast, guess what caused the dead to rise from their graves in Night of the Living Dead? A space probe returning to Earth explodes in the upper atmosphere, spreading radioactive contaminant.