 Woody Allen's 1983 film "Zelig" stars Allen as a curiously nondescript enigma who is discovered for his remarkable ability to transform himself to resemble anyone he is near, and Allen is edited into historical archive footage.In 1984, Christopher Guest co-wrote and starred in the mockumentary "This is Spinal Tap", directed by Rob Reiner.Guest went on to write and direct other mockumentaries including "Waiting for Guffman", "Best in Show", and "A Mighty Wind", all written with costar Eugene Levy.