Of all the groups of people who are more than a little disturbing to speak to, murderers have got to be up there.
We're not talking about someone who has acted in self defence, or who killed someone in a tragic accident, we're talking about cold, calculated murder.
Whether it's an apparent lack of remorse over their actions, or some of the reasons why they decided to kill, killers hold a macabre fascination.
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A video has resurfaced online which shows murderer Stephen McDaniel during a police interrogation, and it has got people very freaked out by how McDaniel - who was later imprisoned for the murder of 27-year-old Lauren Giddings - was behaving.
McDaniel killed Giddings on 26 June 2011 in Macon, Georgia. He used a master key to enter into her apartment. There he strangled her in her bedroom wearing gloves and a mask.
He then used a hacksaw to dismember Giddings' corpse, and concealed it in several locations, with her torso being concealed in a bin.
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What has people freaked out was how seemingly impassive McDaniel appears over the course of a two hour interview.
The video is sped up into a time lapse, and shows just how little McDaniel moves during the course of the interrogation. While the police officers performing the interrogation continually shift in their seats, leaning back and forward, McDaniel appears to barely move at all.
In fact, the most movement that the killer appears to do in the entire two-hour-long time lapse is to place his hands on the table, and to take them off again.
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Other than that, the only movement is his head as it follows the officers around the room. The motion seems almost robotic.
Despite the disturbing display in the police interview, McDaniel was not always so unflappable when being confronted with the evidence of his crime.
After the disappearance of Giddings, local news media got wind of the story and began interviewing Giddings' neighbours.
Among the neighbours who were interviewed was McDaniel.
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In an extraordinary moment, the interview managed to capture the exact moment that McDaniel was told that a body had been found in the investigation.
He becomes visibly shaken by the news, and even ends the interview, saying 'I need to sit down' as he walks off.
Initially, his reaction was explained as being the shock of losing a friend. However, just one day later he became a suspect in the case.
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The discovery that the police had made was in fact her torso, which he had concealed after dismembering her body. Evidence began to emerge from his computer, including posts on message boards about how he hated women and wanted to hurt them.
After confessing to the murder, he was sentenced to life in prison.
Topics: News, US News, True crime, Crime