The Negroni is indomitable. Attack it with skewed ratios, and it rallies. Violate the ingredients, and it stubbornly persists. I can’t think of another drink that you can screw up so thoroughly and still enjoy the result.
This history of the Negroni is disputed, but probably dates to 1919, where the Americano was stiffened by substituting gin for the soda water. Regardless of exactly who created the drink and when, the Negroni is the King of bitter cocktails. If you spy a bottle of Campari on the backbar, the bartender probably knows how to make a Negroni.