Parody mimics the style and conventions of another work to derive ridicule or ironic comment. Marcel Duchamp's painting LHOOQ parodies the Mona Lisa by adding a goatee and mustache. Self-parody involves artists satirizing themselves or their own work, like Ricky Gervais in Extras. Intertextuality refers to how texts influence each other through borrowing and transformation of prior texts. Pastiche prominently features in popular culture through genre works that blend and blur conventions, like Quentin Tarantino's films.