My Theory On Ghost

Do you believe in ghost? I am actually fascinated by the idea of another creature, Such as ghost. And I come up with a lot of theories to explain them. Here's one of them.
First of all, this is what I believe. I believe that some people are more sensitive than the rest. These are the kind of people who will usually first noticed any change of mood in the people around them. They also usually can sense when accidents is about to happen. Or maybe suddenly wake up at night time just because somebody step into the room (very quietly).
Second of all, I believe that whenever we cried, people around us will feel the sadness (eventhough they didn't even see us crying). Vice versa whenever we are happy, suddenly people around us can detect the happiness. My point is, our emotion is actually transmitted out just like a spreading wave (or aura if you want to call it). And people who is the more sensitive will be able to tune in and share the feeling.
I must insist that all my belief stated is totally based on my observation and thought. There is no scientific evidence to support them.
So... whenever a person is murdered or die, usually that will be the most intense emotional state for the person in his entire life. With all that fear and the pain, the person is actually transmitting a very powerful emotion out. So this is my theory. The very strong emotion is so powerful that it was somehow absorbed by the surrounding things at the place, trees, house etc.
The sensitive person we talked about earlier will now go to the place, and somehow absorbed this powerful emotion of fear and pain. He/she will be so overwhelmed by it, feeling the same fear and pain as the person who died.
Pretty much the same concept as dream, our brain will project the fear or try to make sense of the emotion and thus created the so-called ghost. The affected person will now see the ghost as if they are a real being and thus possesion occur.
I hope somebody at least can get what I am meaning to say. Any comments? Or do you have any other insights? Do share. :)
--------------- Personal Note --------------------------
No, I haven't seen a ghost. And I plan not to. I think the scariest ghost stories I ever heard is those from high school. One saying that the student went into the toilet and see an old lady washing clothes. The weirdest thing is that the student did not even feel strange as to why there is an old lady in a boy's hostel. Brushing his teeth very near to the old lady, he started to see flesh and blood from the clothes. And the old lady is actually looking directly at him. :) I just loved high school. They are so creative!!