Will you knock on the door or ring the doorbell? Glue magnets to the back of spiders and put on front door. Bought plastic spiders, magnet tape, can get from Walmart. Hot glued the tape to the back of the spiders and voila! Really creepy halloween door.
Gummy worm ice cubes - infest drinks as they melt. Put the worms in an ice-cube tray, letting them stick out of the top and sprawl over the edges, and fill tray with water; Add cubes to a clear beverage, and watch as kids squirm with delight.