Hands up if you can't hear the words "good thinking" without immediately thinking "...

99"? Barbara Feldon was one of the leading TV icons of the '60s , thanks to her role as Maxwell Smart's more capable sidekick Agent 99 in the comedy series Get Smart . She initially rose to prominence as a fashion model, however, memorably appearing in a TV advertisement for Revlon. READ MORE: 'So much more than our weight': Jelena Dokic's moving message Interestingly, Feldon had been a contestant on iconic quiz show The $64,000 Question in 1957 and won the major prize.

Feldon had initially hoped to be a Broadway star, and she did end up acting. She had small roles in some of the most notable TV shows of the '60s, including The Man from U.N.

C.L.E.

and Flipper . Feldon's big break came in 1965 with Get Smart , which aired for five years until 1970 and became one of the defining series of the era (thanks in no small part to its influence on the vernacular of the time – "missed it by that much!", anyone?) For a daily dose of 9honey, subscribe to our newsletter here . The series, a spoof on the James Bond-style spy genre, written by Mel Brooks and Buck Henry, was a huge hit and earned the actress two Emmy nominations.

Speaking to Forbes in 2016 , Feldon revealed she began taking off her shoes and slouching during filming because she felt "intimidated" being taller than co-star Don Adams – and it seems he wasn't fond of the height difference, either. "When we did the pilot and first stood on .