I'll see your HTML5 + JS Duckhunt, and raise you a 3D virtual reality Duckhunt:
(that's me in the lei halfway through, going on about 35 hours without sleep. Was my final project for http://graphics.cs.columbia.edu/courses/csw4172 the second semester of my senior year in college. And there are some technical inaccuracies in my partner's voiceover...mostly concerning the WiiMote). Something about that game captivates the heart.