Nowadays we're all familiar with one-night games like Fiasco. But when I started playing back in the late 80's, all the systems I encountered were geared for campaign play. Sure there were "tournament scenarios" designed to be played with pre-generated characters in one sitting, but they were very much the exception. As I recall, many of the ones I encountered played up their novelty value with silly themes.
So what was the first system specifically designed and released to facilitate this kind of play?