Every year, our town puts on "Goblins in the Park". It's a one-stop trick-or-treat stop for our kids. We have about 1500 kids come through each year. My husband is the local Chief of Police and we do a booth each year. We are going to build a jail cell with a real life Joker inside. Now, I just need some more ideas to decorate it. We want it creepy, but not too scary. Please Help!!