#9. Party pranks
Before guests are to arrive at your Halloween party, have someone dress up and discretely “haunt” the route your guests will take to get to your house. Later on, tell a “true” story about how someone died a horrific death and the ghost haunts the vicinity.
At your party, keep a cooler on hand for beverages. Put in fake spiders and insects near the bottom. Someone will discover it sooner or later.