By Clark Collis
Updated July 31, 2014 at 03:56 PM EDT
The Dog

On August 22, 1972, a man named John Wojtowicz attempted to rob a bank in Brooklyn to pay for his lover’s sex-change operation—at least, that is what has been long believed. The bungled heist would later inspire Sidney Lumet’s classic 1975 film Dog Day Afternoon, which starred Al Pacino as “Sonny Wortzik” and John Cazale as his fellow robber, Sal. Now, four decades on, Allison Berg and Frank Keraudren have made The Dog, a documentary which relates the real, incredible true story of that August day, and what happened to Wojtowicz afterwards.

The Dog premieres in theaters on Aug. 8 and can be seen on VOD from Aug. 15. Watch an exclusive, expletive-featuring clip of Wojtowicz in the film below.