NEW YORK • Spanish director Paco Plaza was a screaming success in 2007, lauded for his horror movie REC, about a television reporter trapped inside an apartment building.

His latest effort, Veronica, in Spanish and screening on Netflix, is reportedly so unnerving that many viewers, in a bid to escape the sheer horror of what they are watching, stop halfway.

The movie is inspired by a true story of a young girl named Estefania Gutierrez Lazaro, who died in 1992 in Madrid, shortly after using an Ouija board.

She reportedly tried to conduct a seance to contact her friend's boyfriend who had died in a motorcycle accident.

She started to suffer from seizures and hallucinations in the following six months. After she died, her parents revealed that their house became haunted, reported the NME entertainment portal.

Veronica, which was screened at last year's Toronto International Film Festival, has been described by viewers as the scariest movie ever, with scenes of a chain-smoking blind nun especially spooky.

According to Fox News, one viewer tweeted: "Started watching Veronica on Netflix (huge REC fan so interested in anything Paco Plaza is involved in), but the demon-walking-down-the-hallway scene freaked me out so much, I had to turn it off."

Another person warned: "I nearly peed in my pants... Yet another reason to not do an Ouija board."

According to a reviewer in Forbes, what is truly frighteningly good about the movie is not so much the scary scenes, but rather, the performance of Sandra Escacena as Veronica.

"Without her, the film wouldn't be half of what it is," he said.