How many times can Paul say "The History of the Decline and Fall of the Roman Empire" in a single podcast? Lots! But, strangely, fewer times than he references that "Istanbul (Not Constantinople)." 

The Four Lads. "Istanbul (Not Constantinople)." Canada: Columbia, 1953. 
Gibbon, Edward. The History of the Decline and Fall of the Roman Empire. London: Strahan & Cadell, 1777. 
They Might Be Giants. "Istanbul (Not Constantinople)" from Flood. USA: Elektra, 1990.