[REC] and [REC]2
The first REC (do I really have to put brackets around that?) is really relentless and inventive with the origins of its zombie plague (plus Manuela Velasco is as cute as the final anorexic-looking corpse/witch is disturbing).
The second one had some good moments but didn’t hold up as well. SWAT members blindly following orders from someone they find out almost immediately has put them in a shit sandwich didn’t hold up on the suspension of disbelief meter — although the further digging into the supernatural aspects of the plague (and its religious ties) was really fresh. So in the end, I [REC]ommend it. Har, har.