High Quality Content by WIKIPEDIA articles! Po Mo Knock Knock is a 1999 experimental comedy short film written by David Ball and directed by Greg Pak. It is performed by Ball and other members of the New York City improv comedy troupe, The Pollyannas, Bill Stiles and Vin Knight. The title of the film refers to its subject, PostModern knock knock jokes. The film itself is a parody of postmodernism and of postmodern experimental film, through its use of irony, internal contradictions, references to Jacques Derrida, and the Godardian use of title cards.