David Letterman couldn't just stand by and be silent when he heard billionaireDonald Trump is running for President. The former host of The Late Show took a brief hiatus from retirement to roast the embattled candidate in a surprise appearance at Martin Short and Steve Martin's San Antonio, Texas A Very Stupid Conversation comedy tour stop. Letterman told the Majestic Theatre audience on Friday that he was enjoying his new relaxing lifestyle until he heard about Trump's 2016 bid. Read more http://www.people.com/article/david-letterman-top-10-donald-trump