12 Geek Gifts - Day 11

A Lightsaber.
Or more accurately a laser that can cut holes in plastic, fabric, and various other materials, or according to the website:
It will blind permanently and instantly and set fire quickly to skin and other body parts, use with extreme caution and only when using the included eye protection.

But, come on in the right circumstances would be AWESOME! And by "right" I mean most circumstances.

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