I have found that using silly string in your haunt is very fun! I usually buy about 10 cans and hand them out to people who have dressed up and are helping out in the haunt. When ever they (the actors) rise up, jump out, chase, follow, or pop up they'll give a squirt of silly string at the kids. As far as I know it won't stain , it's easy to clean up, and you can buy it in many colors, BUT it is flamable! I have even seen it in black, orange, flourscent colors, blacklight, and glow in the dark. Talk about an awsome blacklight effect! Besides it always makes who ever your shooting it at jump about 4' up in the air, they don't expect anything to actually come right at them!