“What’s your favorite scary movie?” That question started a string of gruesome murders in Woodsboro. Neve Campell, Courtney Cox, and David Arquette return in “Scream 4.” Campbell’s character, Sidney Prescott, returns to her hometown 15 years after the infamous knife-wielding psychos went a killing spree and is once again screaming. And since all of the other characters died in the previous three “Scream” movies, master of suspense Wes Craven got a new crop of targets—Hayden Panettiere, Emma Roberts, Kristen Bell, and Anna Paquin. Also new at the movies this weekend, “The Conspirator,” the true story about Mary Surratt, played by Robin Wright, the only woman held as part of the conspiracy to kill Abraham Lincoln.