Graham Norton reveals the WORST guest he ever had on his chat show

Graham Norton reveals the WORST guest he ever had on his chat show as he describes the interview as 'hell' Graham Norton reveals the WORST guest he ever had on his chat show. The Hollywood A-lister who Graham has deemed his worst ever interview is none other than Mark Wahlberg. The Oscar nominee, 54, appeared on the show back in 2013 to promote crime-thriller Broken City.