We discussed this during our first podcast. Jimbag was correct that Duck Hunt does not work on an LCD. This Penny Arcade forum posting provides a reasonable explanation as to why this is.
"Duck hunt and other light gun games don't work on progressive scan devices. The reason is how the game is designed to work. Here comes some science. When you pull the trigger in duck hunt the ducks are redrawn as white boxes on a black background. If the white box is seen by the light sensor, you score a hit. Now in order to tell which duck you hit the CRT aspect comes into play. A CRT works by drawing in Pixels starting at the top of the screen moving from left to right. When you pull the trigger the NES also takes note where in the clock cycle of drawing on the screen it is. This lets it calculate how many lines have been filled in and where on the screen the white box the gun saw is. So it should work if you have only one duck and sufficient contrast, but two ducks will screw with it, you'll get strange effects like shooting both ducks at once (or just missing depending on how the game is coded)."
For more on how Duck Hunt works, check out this article. Oh, and watch the below Youtube video and let us know if you believe that this person is actually playing on an LCD.
