The MPAA ratings board on Tuesday turned down an appeal of its decision to impose an R rating on Year One , a comedy produced by Judd Apatow and Harold Ramis and starring Jack Black and Michael Cera. Apatow and Ramis appeared personally before the board, hoping to persuade it to change the rating to PG-13. Apatow's movies ( Forgetting Sarah Marshall, Knocked Up ) are generally rated R, but Ramis's ( Ghostbusters, Analyze This, Groundhog Day ) are not.