Motion activated Scarecrow.
Here's what a handful of pvc plumbing pipes and some burlap can do for you. This rotten creature sways in the cold October wind as well as jumps up at passers-by. A motion detector plugged into the 12 volt motor creates a simple but effective motion activated scarecrow. The motor pushes the scarecrow up about 8 inches, turns it left and right and back down. With all the hanging burlap, this makes for a lot of motion. The diagram below gives you an idea of how this was made. I am not mad scientist nor an engineer, so follow it loosely. You'll no doubt see an easier way to build this clunker however this may inspire you to real ghoulish greatness. Dig me up if you have any bloody concerns..