Gross out your little goblins with touch and feel boxes!
Cut a hole in a cardboard box just big enough for your hand to fit in. Cover the opening with fabric to prevent peeking. Set up three or four boxes, and fill them with all sorts of slimy, squishy, scary objects. Have the kids reach in and feel eyeballs (olives or peeled grapes), worms (cooked spaghetti), severed fingers (small sausages), brains (jello or the contents of inside of a pumpkin), etc. Be prepared for the grossed-out screams of delight! And be sure to have plenty of wet wipes handy!