Want to freak out your friends or trick or treaters? Consider making a fake hand and then strategically placing it somewhere:

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It just takes a little plaster of paris, a cardboard box and a few other items.

How to Make a Fake Hand – Instructables – Link.

DIY HALLOWEEN CONSTEST from MAKE, CRAFT, INSTRUCTABLES and POPULAR SCIENCE!
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Makers and Crafters, it’s time to enter our 2nd annual ghoulishly fun Halloween contests! Anyone, anywhere, can enter all or just some of the contests. We’ll have lots of updates and posts regarding all these, but this announcement is to get you started and planning and has more information about where to enter, and our friends @ Instructables and Popular Science – Link (how to enter!). Oh, check out the prizes too! – Link.