Question: What do Trey Parker and Pietro Germi have in common?

Context paragraphs:
Serafino (film): Serafino (also known as "Serafino ou L'amour aux champs" in France) is a 1968 Italian film directed by Pietro Germi.

Cineriz: Cineriz was an Italian media company, involved primarily in the production and distribution of films, founded in the early 50s by the businessman Angelo Rizzoli.  The company catalogue counts also many movies directed by Federico Fellini, Gillo Pontecorvo, Luchino Visconti, Michelangelo Antonioni, Pier Paolo Pasolini, Pietro Germi, Roberto Rossellini and Vittorio De Sica.

Ottavio Alessi: Born in Cammarata, Province of Agrigento, Alessi entered the film industry in 1940 as an assistant director.  In 1945 he started an intense career as a screenwriter, alternating between genre films and art films and collaborating with Pietro Germi, Franco Rossi, Folco Quilici and Luciano Salce, among others.  He also directed two films in the 1960s.

Black 13: Black 13 is a 1953 British crime drama film directed by Ken Hughes and starring Peter Reynolds, Rona Anderson, Patrick Barr and John Le Mesurier.  The film is a remake of the 1948 Italian film "Gioventù perduta" (a.k.a. "Lost Youth") by Pietro Germi.  It was made by Vandyke Productions.

Trey Parker: Randolph Severn "Trey" Parker III (born October 19, 1969) is an American actor, animator, writer, director, producer, singer, and songwriter.  He is known for co-creating "South Park" (1997–present) along with his creative partner Matt Stone, as well as co-writing and co-directing the Tony Award-winning musical "The Book of Mormon" (2011).  Parker was interested in film and music as a child, and attended the University of Colorado, Boulder following high school, where he met Stone.  The two collaborated on various short films, and starred in a feature-length musical, titled "Cannibal!  The Musical" (1993).

Divorce Italian Style: Divorce Italian Style (Italian: "Divorzio all'italiana" ) is a 1961 Italian comedy film directed by Pietro Germi.  The screenplay was written by Ennio De Concini, Pietro Germi, Alfredo Giannetti, and Agenore Incrocci; based on the novel "Un delitto d'onore" ("Honour Killing") by Giovanni Arpino.  It stars Marcello Mastroianni, Daniela Rocca, Stefania Sandrelli, Lando Buzzanca, and Leopoldo Trieste.  The movie won the Academy Award for Best Writing, Story and Screenplay - Written Directly for the Screen; Mastroianni was nominated for Best Actor in a Leading Role (Marcello Mastroianni) and Germi for Best Director.

Commedia all'italiana: Commedia all'italiana (i.e. "Comedy in the Italian way"; ] ) or Italian-style comedy is an Italian film genre.  It is widely considered to have started with Mario Monicelli's "I soliti ignoti" ("Big Deal on Madonna Street") in 1958 and derives its name from the title of Pietro Germi's "Divorzio all'italiana" ("Divorce Italian Style", 1961).

The Testimony (1946 film): The Testimony (Italian:Il testimone) is 1946 Italian crime film directed by Pietro Germi and starring Roldano Lupi, Marina Berti and Ernesto Almirante.  The film was made at the Cines Studios in Rome.  It is one of several films regarded as an antecedent of the later giallo thrillers.

Pietro Germi: Pietro Germi (] ; 14 September 1914 – 5 December 1974) was an Italian actor, screenwriter, and director.  Germi was born in Genoa, Liguria, to a lower-middle-class family.  He was a messenger and briefly attended nautical school before deciding on a career in acting.

Lipstick (1960 film): Il rossetto (internationally released as Lipstick) is a 1960 Italian crime-drama film directed by Damiano Damiani.  It is the feature film debut of Damiani, after two documentaries and several screenplays.  The film's plot was loosely inspired by actual events.  Pietro Germi reprised, with very slight modifications, the character he played in "Un maledetto imbroglio".

Supporting paragraphs: Trey Parker Pietro Germi
Answer: actor