About 600 years before Prague's popular uprising brought down Communism, the Czech people began a long tradition of what might be considered a unique form of political protest.
In 1402, Jan Hus, a lecturer from Prague University, became the leading voice in a growing condemnation of the Catholic Church. From a pulpit in Old Town's Bethlehem Chapel (later destroyed but reconstructed in the 1950s), Hus gained popular support for his claims that the omnipotent power of the mostly German-dominated clergy had to be contained. In 1414, he was invited to the Catholic ecclesiastical Council of Konstanz to explain his beliefs. Though the emperor had promised Hus safe conduct, on arriving he was promptly arrested, and a year later he was burned at the stake. The Protestant Hussite supporters declared him a martyr and rallied their calls for change around his death.
On July 30, 1419, a group of radical Hussites stormed the New Town Hall on Charles Square and demanded the release of other arrested pro-reform Hussites. After town councilors rejected the demand, the Hussites tossed them out of third-story windows, killing several. This became known as the First Defenestration, from the Latin for "out of the window." The incident sparked a 15-year battle known as the Hussite Wars, which ended in the defeat of the radical Protestants in 1434.
By the 17th century, the Austrian Catholics who came to power in Prague tolerated little dissent, but as Protestant Czechs became ever more wealthy, they began criticizing the Habsburg monarchy. This bubbled over again on May 23, 1618, when a group of Protestant nobles entered Prague Castle, seized two pro-Habsburg Czechs and their secretary, and tossed them out of the eastern window of the rear room of the Chancellery -- the Second Defenestration. In the Garden on the Ramparts below the Ludwig Wing, two obelisks mark where they landed. This act led, in part, to the conflict known as the Thirty Years' War, which ended again in victory in 1648 for the Catholics. The Habsburgs remained in power for another 270 years, ruling over Prague as a provincial capital until the democratic Czechoslovak state was born.
Though Prague's 1989 overthrow of the totalitarian Communist regime gained the name the Velvet Revolution for its nonviolent nature, scattered calls for another defenestration (some serious, some joking) were heard. Contemporary Czech politicians surely know to keep away from open windows.