If you want to scare intruders at night time, this one would do quite a good job.
Another project that I would love to do, is to take a shop mannequin and cover it completely in pine cones. It would take alot of work, but the result could be very effective. I just need someone to give me a mannequin, as I'm certainly buying one just to do that with. Maybe I should hassle the BBC props department for one!