>> darling. mr. kimble would have waited. you should have used the ladder. >> "green acres" is the kind of show america loves. and cbs thinks, well, we can do more of these rural characters. >> yeah. the rural comedies. "petticoat junction." >> means some really silly funny stuff. ♪ hee-haw hee-haw ♪ >> but the characters were caricatures of rural people. it became very hokey. >> you're looking at people sitting in their high-rise offices in new york showing the north what they thought the people in the south were. >> they all had pretty high ratings, and cbs became known as the country broadcasting system. >> but in the late '60s, ratings and demographic tools improved significantly. networks are able to see the ages, the education level, what