Using a computer screen and a sheet of glass you too can create a hologram! As this video shows,simply use the correct monitor (depending on what you want to do) and a piece of glass positioned appropriately to create the holographic image:

Make a Halloween hologram – 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.