X is a play in three acts by Tom Taylor. The play is a farcical comedy whose plot is based on the introduction of an awkward, boorish American to his aristocratic English relatives. It premiered at Laura Keene's Theatre in New York City on October 15, 1858. The play concerns the adventures of an American, Asa Trenchard, first played by Joseph Jefferson, who goes to England to claim the family estate.
The play's most famous performance came seven years later, at Ford's Theatre in Washington, D.C. on April 14, 1865. Halfway through Act III, Scene 2, the character Asa Trenchard (the title role), played that night by Harry Hawk, utters a line considered one of the play's funniest:
"Don't know the manners of good society, eh? Well, I guess I know enough to turn you inside out, old gal—you sockdologizing old man-trap..."
During the laughter that followed this line, something very iconic happened.
Give me X and the "thing" that happened!!
Ans:The play is "Our American Cousin" and the "thing" that happened was Lincolns assasination.