Today in 1991, a broken and suicidal J.R. Ewing raised a pistol and - off camera - fired a single shot. The ambiguous ending marked the end of CBS' Dallas, one of the most popular prime-time dramas of all time. For 13 seasons, viewers followed the ups-and-downs of the Ewing clan, a Texas family made wealthy by success in the oil and cattle industries. The show was one of the first to embrace season-ending cliffhangers; in 1980, an entire nation spent the summer asking, "Who Shot J.R.?" (Speaking of J.R. and guns, considering Larry Hagman - who played J.R. Ewing - appears in TNT's new version of Dallas, it's safe to say the did-he-or-didn't-he mystery has been solved.)