Yes, it's very possible. People might have reasons to hide the fact that they saw something. Maybe they're afraid of getting involved or they've been threatened. So they claim that no one saw a thing when in fact they did.
Yes, 'The Texas Chainsaw Massacre' was inspired by the real - life crimes of serial killer Ed Gein. Gein's disturbing activities, such as grave robbing and using human body parts for various purposes, provided the basis for the horror elements in the movie.
I'm not sure specifically which 'no one saw a thing real story' you're referring to. It could be a story where no one witnessed a particular event, like a crime or a strange occurrence. Maybe it's about a mystery that remains unsolved because there were no eyewitnesses.
No, ghost stories are mostly fictional. They are made - up to thrill and scare people. There's no scientific evidence to prove the existence of ghosts.
The movie 'I Saw the Devil' doesn't seem to be based on a particular true crime. It uses a lot of common elements found in crime and thriller stories, like a serial killer and a revenge - seeking protagonist. But these are just tropes that are used to create an engaging and disturbing narrative. It may be inspired by the general idea of the dark side of humanity that exists in real - life, but not a specific true - crime case.
The 'Saw' series is said to be loosely inspired by real - life events related to Jigsaw Killer. Some elements might be drawn from cases where killers used elaborate traps and mind games with their victims, but it's highly fictionalized. For example, in some real criminal cases, killers have used complex setups to torment their victims, which could have given the creators the idea for the movie's signature traps.