Here is an epic LEGO Portal gun that is fully functional. The gun took a year to plan, and 3 weeks to build. It has just under 2,000 pieces, and has a LEGO Mindstorm controller to help open and close the prongs and turn on the light effects.
Check out the video of the gun in action:
I love seeing it in action, but I personally don't have the patience to build something like this. What would you build if you had the time and inclination?
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Source: Geekologie (http://www.geekologie.com/2012/07/lego-store-employee-builds-functional-le.php?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+geekologie%2FiShm+%28Geekologie+-+Gadgets%2C+Gizmos%2C+and+Awesome%29)