This kind of falls under the category "If the aliens pick the right night to invade, we'll never notice it until it's too late":
Authorities in Delaware said a woman's body was found hanging from a tree Wednesday after she apparently committed suicide. But they say it went unreported for a few hours, because people walking by thought the body was a Halloween decoration.Posted by Chris at October 27, 2005 05:25 PM
The body was suspended by rope from a tree about 15 feet off the ground in Frederica.
The wife of the town's mayor told a Wilmington paper (The News Journal) that it looked like "something somebody would have rigged up."