The Girls Next Door (2005) : 1x10

There's something spooky in Bridget's room--and it ain't Gizmo. It's Halloween at the Playboy Mansion! While Holly and Kendra put their wits together to decorate tombstones, Bridget sets out on a full-scale ghost hunt. She contacts a paranormal investigator to get to the bottom of the Mansion's long-running history of spirits--and even puts together a séance. After the Mansion's mysteries have been explored, Hef and the girls relax with a movie in his bedroom. They watch The Fly and a horror classic created by and starring Hugh M. Hefner himself at the tender age of 16. As the lights go out, it becomes apparent that the force pervading the Playboy Mansion is Hef's youthful spirit!