A meteor lands in the sticks, and a slimy tentacled creature enters a local's body (Michael Rooker), turning him into a squishy monster with a hunger for meat that drives him to devour most of the people and animals around him. Gross-out horror comedy is my least favorite genre, but this movie's so skillful I have to take my hat off to it. Writer-director James Gunn, who worked on the script of the 2004 remake of Dawn of the Dead, relies too much on George A. Romero's imagery without trying for any of his or Joe Dante's satire. But he's so adept at laughs, thrills, and repulsive effects that even the product placements are inspired, and he gets the most out of Nathan Fillion, Elizabeth Banks, and Gregg Henry. R, 95 min.