I always saved that type of effect for my closer. To best explain I would like to give you a description of my stage show.

I opened with a brief talk to let the audience have some idea about the things they were going to experience. I do only three effects and all need stories to set them up.  

If the room was on the small side I would invite four or five people on stage to sit around a table and do my "Feather Psycho kinesis" The reaction of those sitting around the table told the rest of the audience that something very strange happened.

In a larger room I would open with Masklyn ye Mage's "Damballah" A very strong effect both visibly and audibly for the entire audience and a real shocker for those on stage at the time.

The second effect was my "Poltergeist" This is an emotional routine for the audience. It deals with the death of a very young boy who comes back to his house to be near a toy box that his father had built for him. It touches the audience.

My closer was, "The Effigy of Pazuzu" This is where I wanted to leave them chilled and maybe wet. What seems to be the end of the effect is when this evil effigy starts to send smoke out from it's nose and mouth, this is followed by flames, then the stomach starts to glow and flames erupt. I am standing behind it, facing the audience. I am horrified, it is obvious that this was more than I expected to happen. In terror I shout out, "My God....he's escaping."

Now those little extras I was talking about kick in. At my line, ...he's escaping, all the house lights go out. At a five count, a woman seated near the front lets out a loud scream....another five count and another scream is heard from the back along with many other noises from the audience as they feel icy cold or hot droplets falling on their face in the darkness and then another voice shouts, "For Gods Sake someone turn on the lights."  

The lights come on. If I have been paid before the show, when the lights come on both Pazuzu and I are not to be seen.

If I have to wait to get paid they see me blankly starring out to them, blood and spittle dripping from my lips. Two assistants help me off the stage, then one comes back and announces that the show is over.

I'm not trying to pat myself on the back, but I have never seen a stronger closer in my life.

The details of the little things: First: At the key line you must have someone to turn off the house lights.

Second: You need two women, one seating in the front and one in the back of the house. The one in the front counts off a five beat to herself then lets out that terrible scream. The woman in the back starts her five beat count after the first scream.

Third: The icy or hot droplets come from two people armed with water pistols filled with ice water. They work the outside aisles of the house squirting the cold water up into the air over the audience. In the dark it is almost impossible to tell if it is something very hot or very cold hitting your face.

Fourth: One of those with the water pistol counts off a seven beat after the last scream, then screams himself, "For God's Sake, someone turn on the lights."

Fifth: Whoever is working the lights counts off a three beat and turns the lights back on.