That's obviously John Wilkes Booth on the right, followed by Abraham Lincoln going, "But I wanna know what happens next! D'aww ..." and first lady Mary T, but unless you're a history buff you probably don't know that the other two are Union Army Major Henry Rathbone and his wife, Clara Harris, daughter of a prominent U.S. senator. Rathbone is best known for trying to stop Booth and getting a piece of that dagger you see up there for his trouble, and not so much for the Kubrick-esque horror that his life later spiraled into.
Rathbone was seriously injured while attending the most disastrous double date in history, and though he physically survived the attack, his mind never recovered. The officer blamed himself for failing to stop Booth, and even though he eventually married Clara two years later, wedded life only added to his insanity.
Eventually, Rathbone's mind deteriorated to the point that on Dec. 23, 1883, he decided to deck the halls with his family's blood. While serving as a U.S. consul in Hanover, Germany, Rathbone tried to kill his three kids, and when his wife stopped him, he fatally shot and stabbed her, then stabbed himself -- mentally replaying Booth's actions from 18 years earlier.