Another scary movie is coming to the box office — but there should be more laughs than screams coming from theatergoers. The latest horror parody in Paramount and Miramax’s “Scary Movie” franchise is hitting theaters this weekend and has made $7.7 million in previews. Paramount is projecting a $40 million opening for “Scary Movie,” though other estimates are between $45 million and $50 million. If lots of horror fans turn out to see just how their beloved films, like “Weapons,” “Longlegs,” “