Cameron Flubs Letterman's UK Quiz 'I've ended my career on your show,' he quips By Rob Quinn, Newser Staff Posted Sep 27, 2012 12:54 AM CDT 3 comments Comments David Cameron talks with David Letterman after he addressed the United Nations General Assembly in New York Wednesday night. (AP Photo / Stefan Rousseau/PA) (Newser) – David Cameron became the first serving British prime minister to appear on the Late Show With David Letterman last night, but he was stumped by some of the host's questions—about Britain. The band played "Rule Britannia" to welcome Cameron, who guessed that the composer was Edward Elgar rather than Thomas Arne, the Financial Times reports. He correctly answered that the Magna Carta had been signed in 1215, but didn't know that it meant "Great Charter" in English. "I’ve ended my career on your show tonight," Cameron quipped. Cameron, who is in New York for the United Nations General Assembly, raised a laugh when he discussed Britain's relationship with the US, reports the BBC. "There were some good bits and some less than good bits, and obviously we had a bit of a falling out. I like to think we've got over that now," he said. "My country’s very different and the idea of not having gun control I find difficult, but that’s why you have to respect each other’s political traditions. We interfered a bit in your politics about 200 years ago when we sailed up the river and burnt down the White House," he joked.