Daybreakers (2009)
My rating: 1 of 5 stars
A new twist to vampires - they rule the world. Humans are lunch meat trying in vain to fight back. One scientist finds a cure to the vampire plague. What he doesn't realize at first was that he actually found two cures. Limited exposure to sunlight in order to burn away the virus without killing the host. Consequently, any vampire feeding on a human that was a vampire turned back will also change back into a human. Nifty trick if it didn't mean the vampires all go crazy over the blood and everyone eats each other to achieve it.