Can you recommend some horror documentaries based on true stories?

Another great one is 'The Imposter'. This is a truly disturbing story. A French man impersonates a missing Texas boy. The documentary shows the real - life interviews and the strange events that unfold as the imposter tries to fit into the family, blurring the lines between truth and lies.

'Hoop Dreams' is also worth mentioning. It follows the real - life stories of two African - American high school students who dream of becoming professional basketball players, showing the challenges and hopes they face along the way.

One well - known betrayal documentary based on a true story is 'The Jinx'. It delves into the life of Robert Durst, a man suspected of multiple murders. The documentary reveals how his actions over time seem to be a betrayal of those around him, including his family and friends. It's a gripping exploration of a complex character.

There's also 'Cropsey'. It's based on the true story of the legend of Cropsey, a boogeyman - like figure on Staten Island. But as the documentary unfolds, it reveals a more disturbing and real - life story of a mental institution and disappearances in the area.

Sure. 'The Cove' is an excellent one. It exposes the cruel dolphin hunting in Taiji, Japan. It's a shocking revelation of an ongoing practice.

'Blackfish' is also highly recommended. It focuses on the treatment of orcas in captivity, especially at SeaWorld. It shows how these intelligent and large - scale marine animals are affected by being confined in small tanks and the implications of their training for shows.

The fact that they are based on real events. People are often drawn to the idea of the unknown and the real - life horrors that others have faced. It gives a sense of authenticity that fictional horror doesn't always have.

The sense of authenticity. Knowing that these events actually happened makes it scarier. For example, in 'The Act of Killing', the fact that the killers are re - enacting their real - life murders is both fascinating and terrifying.

Not always. Some documentaries might take creative liberties or present one-sided views.

One great one is 'Icarus'. It delves into the world of doping in sports. The filmmaker originally set out to make a film about his own attempt at doping to compete in a long - distance cycling event. But as he dug deeper, he uncovered a major international doping scandal. Another is 'The Act of Killing', which is about the Indonesian mass killings in the 1960s. It's a very powerful and disturbing documentary as it gets the actual perpetrators to re - enact their crimes in different cinematic styles.