View Comments When word came out that Chris Rock was starring in “Spiral,” a spinoff of the “Saw” movies, he seemed like an odd choice. Having seen “Spiral” he’s still an odd choice, but by far the best one in a lazy movie of misfires. It was reportedly Rock’s idea to reboot the franchise with him in it, which explains why he is also an executive producer of the film, subtitled “from the Book of Saw” like it was some lost artifact of torture-porn legend or something. It’s not. It’s just a dumb horror movie with a smart lead actor who gets off to a funny start riffing on why “Forrest Gump” couldn’t be made today while on an undercover assignment and works inexorably toward him screaming and facing the Impossible Choices that define the “Saw” films.