Why do they happen?
What makes someone more vulnerable to them while others never experience it?
How can possessed people be set free?
Is there a way to help them at all?
In which cases there isn't?
Do you have a personal experiance of possession or coexisting with a demon/spirit/whatever, and if so, have you tried to free yourself, what did you do, and did it work?
Does someone you know?
Can exorcism be performed without someones' approval?
With which illnesses it it usually confused?