I have watched quite a number of programs relating to the supernatural, especially Most Haunted where the team spends the night in a reputedly haunted location and try to communicate to the ghosts there by calling out phrases like,
"If you are here, please reveal yourself by tapping on this table/opening this door/making a noise/make yourself visible/any other way - please reveal yourself now...
Often a noise is heard and the team member cries out, "What was that??" or another member suddenly scream and makes a run for it after seeing "something" at the corridor or room. They often come out with temperature changes, especially a local "cold spot."
Unfortunately, none of these things had convinced me of any paranormal entities. This I felt more when a report of something visible was seen - yet was never captured on camera. Furthermore, the team has confessed to hoax. It is easy to to drop an object, such as a stone, well away from the camera but within easy earshot. It is just as easy to scream and run away from "nothing" as of course, they failed to capture on film. As for temperature changes, smells, being touched or floorboard vibrations, we have nothing but to take their word for it.
The most "genuine" paranormal activity was at a haunted office, with modern computers, internet site and so on. A camera was installed, which captured a chair moving slowly by itself. Yea, it was scary. Unfortunately, only the upper part of the backrest was visible above the desk. After it stopped moving, the team tried to "prove" the genuineness of the activity by showing us that nothing was attached to any of the chair legs. But I did glimpse at what looks like a telephone cable looped around one of the legs. Another con trick played by someone not in the room.
I personally believe in the supernatural, and of genuine paranormal activity. But just about all these "Paranormal Research" programs has failed dismally to satisfy.