I think I saw Poltergeist at the wrong time. I was thirteen, it was at the cinema and, frankly, I was dealing with this phenomena at home. To this day, however, I don't support the accepted definitions of poltergeists.
At that time, what I experienced was pretty exasperating but mild. Leaving the cinema, I couldn't tell what was going to happen to me or my family.
The events that we lived through were pretty run-of-the-mill where such activity is concerned: objects moving, physics-defying destruction of property and performances for guests.