Channel your inner paparazzi by taking lots of candid photos. Include costumed kids and adults at your next Halloween party, behind-the-scenes costume prepping, candy counting or the random shots of trick-or-treaters. Interactions between adult friends dressed in poodle skirts or of your daughter applying fake blood to her face -- these are priceless moments.
Getting really good candid photos isn't the same as when you're setting up posed shots. Instead of taking one great photo, you'll want to take many to increase your chances of getting that one perfect shot. Oh, and turn off your flash -- nothing's going to kill the spontaneous mood faster than a blinding flash across a little monster's face.