User blog comment:Gameshowguy2000/$0 on Jeopardy! is NOT a winning score!/@comment-2166074-20160311224717

Well, it's never happened in the Trebek era (three in-the-red totals after DJ!), but supposedly it occurred at least once in the original Art Fleming run. By the recollections of it, they didn't play FJ!, just padded the rest of the episode out by talking with the contestants to close out the show, three new players the next day.