Film director Bob Clark and his son Ariel were killed in the crash that kept Pacific Coast Highway closed through the Palisades during today's morning rush hours. Clark directed A Christmas Story and was the producer of the "Porkys" films and other features. The LAT says the crash occurred about 2:30 a.m. and kept PCH closed for investigation between Temescal Canyon Road and Sunset Boulevard until 10:40 a.m. Clark was 67 and his son was 22. The driver of the other vehicle involved in the head-on crash could be charged with driving under the influence of alcohol or drugs, as well as manslaughter.