Well generally just to experiment and see if it can be done.Because poltergeists are neither very capable nor very obedient.
Sure, depending on what you want to achieve you could do it... But why would you, when there are better options out there?
I have had several poltergeist things happen in my house. Not sure if my house was like this allready or i attracted it myself. I should of saved this card but i remember there was some card a old roomate put on the top of a door way. One day it just flew down by itself so i put it on a book shelf. Another day the same card flys out of the book shelf.Has anyone considered manifesting a poltergeist by condescending the residual psychic energy of old/common spaces.
In theory this energy is just there to take, why not manifest it for one purpose or another.