[REC]

A beautiful female TV reporter and her cameraman follow a group of firemen on a call. They go to an apartment building where loud screams are heard from an elderly woman's unit. The fireman break into her apartment. She's bleeding and screaming nonstop and attacks them. It seems she's infected and the other residents might be too. Authorities seal off the building allowing no one out and they all have to deal with each other...and the infection.

VERY bloody and gory with good acting. Even better it moves quickly (it's only 78 minutes) and never stops. Very scary and unsettling. It was remade in the US as "Quarantine" in 2008. That's good too but this is better!