( CNN ) -- David Letterman has been taking some heat and issuing some apologies for the off-color joke he made last week about Alaska Gov . Sarah Palin 's daughter , but he found a sympathetic critic in comedian Jeff Foxworthy on Monday . Jeff Foxworthy , the father of two teenage daughters , says David Letterman 's joke was flawed . The best-selling comedy recording artist in history paid a visit to CNN 's `` Larry King Live '' to talk about Letterman 's gaffe . `` As a father of two teenage daughters , it was a flawed joke , '' Foxworthy said . Letterman joked last Tuesday that Palin 's `` daughter was knocked up by Alex Rodriguez '' at a recent Yankees game , stirring up an angry reaction from the Palin family . Letterman has since apologized twice for what he called `` inappropriate '' humor . And Foxworthy agreed : `` I do n't think any kind of joke about someone having sex with a teenage girl is funny . '' Watch Foxworthy comment on joke » . But Foxworthy 's rebuke of the joke was gentle in tone , and he showed empathy for Letterman as well as the Palin family . `` As a comedian , you look at what Dave does , '' Foxworthy said . `` You 're trying to do this night after night , year after year , decade after decade -- at some point in the road , are you going to throw one out there you should n't have ? Yeah . '' Foxworthy said it 's probably time to forgive and forget . `` It 's about forgiveness , '' Foxworthy said . `` He came back and apologized and said : 'Hey , the joke is flawed . ' And to me you move on . '' King asked what advice he 'd give Sarah Palin if she received an invitation to appear on Letterman 's `` Late Show . '' Foxworthy said he 'd encourage the Alaska governor to accept it . `` Life is about forgiveness . I think that makes her bigger to go on there and say ' I accept your apology ' . '' Letterman has insisted he was referring to Palin 's 18-year-old , Bristol , who gave birth to a boy in December , and not her 14-year-old , Willow , in the joke . Palin has called that a `` weak , convenient excuse '' for a joke that was '' inappropriate '' no matter which daughter was the target . Foxworthy , the author of `` How to Really Stink at Work , '' also made some `` confessions '' about his pre-comedy career in corporate America . `` I was at IBM for five years ; I do n't know how much work I did , '' Foxworthy said . The comedian , who said he used to make prank phone calls to his boss at work to lure him back and forth from his desk , had this tongue-in-cheek advice for people about how far to take things on the job : . `` You do n't really want to get fired ; you want to have a job . But you do n't want to do it well , because you 're going to be promoted , and that 's a lot of pressure . Who can have any fun with that kind of anvil hanging over your head ? '' Foxworthy is also the host of `` Are You Smarter Than a 5th Grader '' and talked about the appeal of a game show that spotlights how much people tend to forget after all those years of cramming in facts at school . `` It 's a strange thing why the brain keeps some things , '' Foxworthy said . `` Like I do n't know why my brain has all the words to 'The Brady Bunch ' theme song , but it deleted everything about triangles . ''
David Letterman made off-color joke about Gov . Sarah Palin 's daughter last week . Foxworthy : `` As a father of two teenage daughters , it was a flawed joke '' Foxworthy also says he thinks Palins should accept Letterman 's apologies , move on . The comedian also has `` advice '' about having fun on the job .