Fill a big pot with prizes wrapped in black and green paper and throw a bunch of other gross stuff in such as rubber spiders and snakes, cobwebs, popcorn Styrofoam to make it look like a big stew. Keep paper towels handy, etc. to make it look like a big stew. If you are really daring you can add cooked wet spaghetti or Jell-O. Then have them reach their hand in for prize (if they dare!). For added fun, turn the lights down and/or blind fold each person before they reach in. Have fun!