Some of the program shown is discovery channel might no be real.

Some are boasted to create attention of the audience.

Personally, i dont believe in ghost. Though there are many ppl outside there claimed they saw or feel the ghoest. These story can be vary as each race have their own kind of ghost. Pontianak? Kuntilanak? Vampire? Zombie?

If there are ghost outside there, it might just a feint voice as shadow, AS spirit/ dead ppl dont have a physical body? i mean logically.

Still, i dont believe in that unless i saw one ( touch wood )

Seeing is believing.