Halloween takes on a WHOLE different meaning when you are in Second Life. I was just looking around The Ivory Tower of Primitives tonight when I ventured upon a Haunted House (left). It is similar to Mr. Toad's Wild Ride at Disneyland. You sit in a car, pay $10 Linden (about 2.5 US cents), switch to the Mouse view and it will take you on a 4 minute ride of special effects. Quite innovative. Here is the SLurl http://slurl.com/secondlife/Natoma/34/255/27
There are other Halloween experiences like the haunted Pumpkin Patch in Shanghai City. It is filled with scary experiences. It is best to turn your "Environment Settings" to midnight.
What have you found?