Hogan's Heroes ran on CBS from 1965 to 1971, set in a German prisoner of war camp during World War II. John Banner played Sergeant Hans Schultz, the likeable guard who often turned a blind eye to the prisoners' schemes, while Werner Klemperer played his commander Colonel Klink. Schultz's I know nothing, often paired with I see nothing, became the show's most quoted catchphrase. Clips and reruns kept it alive for decades, and online it survives as a shorthand denial for anyone avoiding blame.