Whether the greatness of Citizen Kane is due to Orson Welles's writing or Herman J. Mankiewicz's contribution to the screenplay has always been up for debate. The Third Man squashes this argument. On the spur of the moment, Welles comes up with one of the most memorable and brilliantly written monologues in cinema history.
Harry Lime: Don't be so gloomy. After all, it's not that awful. Like the fella says, in Italy for 30 years under the Borgias, they had warfare, terror, murder, and bloodshed, but they produced Michelangelo, Leonardo da Vinci, and the Renaissance. In Switzerland, they had brotherly love; they had 500 years of democracy and peace, and what did that produce? The cuckoo clock. So long, Holly.
And the zither music ain't bad, either!