Curtains fall on Late Show with David Letterman 6 Photos . Updated: 20 May 2015, 01:05 PM IST Livemint Late Show with David Letterman, the iconic talk show that began back in 1993 on CBS, ends on 20 May 2015. Having hosted scores of celebrities, this also bring to an end Letterman's 33-year-long career. Here are glimpses of some of the memorable episodes- 1/6David Letterman broadcasts his final show on Wednesday, ending a historic 33-year run of the unpredictable, caustic comedy show. The 68-year-old Letterman has been the longest-serving night-time talk show host in US TV with more than 6,000 shows to his name. 2/6Bill Murray, American actor and comedian, was the first person to appear on the Late Show with David Letterman on August 30, 1993, and was also one of the most frequent guests. AP 3/6When pop star Madonna appeared on the show in 1994, the show received some of its best ever ratings. Her use of expletives and the F-word 13 times, made it one of the most censored talk show episodes in American history. 4/6Paul McCartney performed with his band atop the marquee of the Ed Sullivan theater on Broadway in New York that hosted the show on 15 July, 2009. Reuters 5/6Sacha Baron Cohen made some really “uncomfortable” comments when he appeared on the show for the publicity for his film Borat in 2006. 6/6US President Barack Obama appeared on the Late Show on 21 September 2009, marking the first time that a sitting president of the United States appeared on the show. He has appeared thrice on the show. Reuters