(cheersplauseapplause d& tonight front line travels to new york city while thousands of manhattan residents go innocently about their daily lives. on west 54th street award-winning talk show host stephen colbert faces the biggest challenge of his career. >> stephen: my guest tonight produces hard hitting investigative journalism for pbs. >> an interview with front-line executive producer david fanning. >> stephen: i'll ask what it is like to work with famed pbs reporter kermit t frog. please welcome david fanning. >> it's a conversation colbert has been preparing for since 4:00. (cheers and applause) his cameras were there, tonight on frontline, colbert versus fanning. >> stephen: david, thank you so much for joining me. i have wanted to have you on for a long time just to tear you a new one. okay. >> you're the eck difficult producer of frontline. which is if i'm not mistaken the last news or documentary program that does long form investigative journalism. >> left on television. >> stephen: left on television. >> neff's given up. >> stephen: why not throw in the towel, you're the last of