They are very very real !!!

How Did They Get Here?

There are a number of different scenarios in how a location can become infested with a negative entity such as a malevolent spirit or worse a negative non-human entity, including demons. They can be

* Invited (Unintentionally or intentionally) Through the use of divination practices (such as Ouija boards) or even amateur EVP sessions, these entities can be unintentionally invited into a location. They can sense that someone is willing to communicate with the spirit world and they use that opening to invade your space. Even attempts by a previous resident can cause problems for you. Locations in which there were even darker intentions (rituals), where evil has been invited in is especially problematic for many years.

http://www.manchesterparanormal.org/Negative-...