The most famous episode of Dallas -- and still one of the most-watched hours in TV history -- was the season-ender that aired on this night (March 21st) in 1980. That night, Larry Hagman's notoriously despicable J.R. Ewing was shot by an unseen gunman. Almost immediately, "Who shot J.R?" became the number-one water-cooler topic.
Do you remember where you were?