Invented and introduced to the marketplace at the cusp of the 1960s, Mattel's Chatty Cathy doll was a staple of American girlhood. 

 

Its selling point was a pull string that elicited a variety of preset phrases ranging from "Will you play with me?" to "Please take me with you." Besides Barbie, another Mattel creation, Chatty Cathy was the most popular doll of the 1960s.  

 

Chatty Cathy inspired "Twilight Zone" episodes,   whose writers predictably invented a sinister variant -- the malicious Talky Tina. 

According to Wikipedia, two "Brady Bunch" performers, Maureen "Marcia" McCormick and Eve "Jan" Plumb, were in the original adverts for  Chatty Cathy.  She has again emerged in pop culture as a talking point in Geico ads.  

Click here to see the original Chatty Cathy advertisement.