In almost 20 years and with 13 feature-length films, Quentin Dupieux has become a heavyweight in French cinema, thanks to an effective formula: short, inexpensive films shot at breakneck speed with a dream cast. His latest, ‘Le Deuxième Acte’ (‘The Second Act’), which stars Léa Seydoux, Louis Garrel, Raphaël Quenard and Vincent Lindon, opened the Cannes Film Festival on May 14.