Petlja is a 2015 Serbian erotic thriller directed by Milutin Petrović in which a group of people become entangled in a search for Šime, a mysterious and legendary underground filmmaker and photographer who has gone missing, with the investigation slowly pulling everyone into a dark world of eroticism, voyeurism, and obsession as selected elements of film language are used to explore the boundaries between watching and being watched, desire and art, reality and fantasy.