So... Uni-Corn had a major ghost issue, but one that was quite distributed. We were attacked by massive amounts of ghosts.
So, utilizing a series of intelligent moves on my part (including my knowledge of explosives), I was able to determine that the cause was a cursed artifact: A painting of a "Golden Sea Of Wheat".
Yeah, not so golden and shiny when looked at with Paragoggles (The Goggles, they do SOMETHING!). Hordes of starving people standing in the field, all trying to get at the food. Well, after a hose-down with positive-emotionally charged slime, I stored it safely in the bulk slime container in Ecto-W1, and demonstrated what the hell the manager of the place had.
We now have a nice new painting at the former Masonic Lodge that is Spook Central, in a specially-made frame and glass. Just... Don't look at it out of the corner of your eye.