The gun from Nintendo's Duck Hunt doesn't actually shoot anything; it is a light receiver.
When you pull the trigger, the screen goes black for a split second, and then a white shaped duck appears over the black. The gun is just a sensor for a change in light (from black to white) so if it’s pointed where the duck is, it’ll pick up the black screen and then the white duck.
Early versions of the gun allowed you to point it at a constant light source (like a lamp) and cheat, but Nintendo changed it so that the gun needed to sense both the black screen and THEN the white spot.
(source)
Asked by: Aviamon
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I always wondered.
Also, yet one more reason why you couldn’t shoot that horrible, horrible dog.

![xavierjones:
via www.alwayswithhonor.com
WANT. [waiting for reprints…]
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I sort of want the owl one, but this is also awesome.](http://20.media.tumblr.com/tumblr_kubeuy2Gqq1qztmh3o1_500.jpg)