hey, poltergeist!
sometimes it's okay to do a lil tomfoolery.
your goal: fuck shit up.
pick a room that has stuff, but not too much stuff. bring the living guy to that room and let them look around. tell them they should memorize where everything is. pictures and stuff are allowed. they can do whatever they want to memorize that shit. don't care.
long story short: after two minutes, you'll shoo 'em out of the room and disrupt three things.
if they get really stuck after a bit of time, give 'em hints. it's okay if it takes a while, though. you can toy with 'em
ALTERNATIVE: if they don't get one object, tell them what you did and tell them to come back to the room in 30 seconds. do a different thing of the same difficulty. let them try to find that.
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once they're done, tell em that they get to ask you ONE QUESTION that you can answer honestly. they also get to ask one other ghost at any point in the game. but let them know the limits:
long story short, don't break the game.