The 64 year-old talk show host let a bomb slip while interviewing Howard Stern.
The radio veteran appeared as a guest on the show to talk about a new app and ended up bashing Jay Leno for half of the interview.
“I want to see you beat Jay Leno in the ratings tonight,” Stern remarked, to large applause from the studio audience.
“I gotta tell you, I am so fascinated by the late night wars and what’s going on – I bought the book about it by Bill Carter and I follow this like the Torah! I study it, I love it!”
“You know, as well as everyone else in this room – Jay is horrible, right?” he quipped.
During the interview, Stern point blank asked Letterman, “how much longer are you doing this, really?” Letterman responded, “I don’t know. Maybe two more years?”
According to Bill Carter’s new book, “Tonight Show, The War for Late Night,” Craig Ferguson, the wily, Scottish comic actor who hosts the Late Late Show on CBS after Letterman, has been guaranteed he will be anointed successor whenever Letterman stops doing The Late Show.