Rod Serling's Twilight Zone is, quite simply, the greatest television show ever. Of course, looking at the televisual landscape today, it doesn't seem like there's much of a contest; nevertheless.... This is one of my top three favorite episodes. I still get emotional on Gart Williams' behalf. "Some people aren't built for competition, Janie."
Edit 2-24-2013: Cheers to IMDb and Hulu for this. Features limited commercials. Maybe it's just this operating system (Vista); maybe you have to open this post in its own window to see the embedded feature. Just click the title above.