This occurred in 1984 on a program entitled "Press Your Luck." Michael Larson, an unemployed ice cream truck driver, figured out how to beat the system:
Watching the show at home and with the use of stop-motion on a VCR, Larson discovered that the presumed random patterns of the game board were not random and was able to memorize the sequences to help him stop the board where and when he wanted. On the single game in which he appeared, an initially tentative Larson spun a Whammy on his very first turn, but then played 45 consecutive spins without hitting a second one. He earned a total of $110,237 in cash and prizes, a record for the most money in cash and prizes won by a contestant in a single appearance on a daytime network game show...Details of the event are explained in his biography, and time-compressed in the video above.
Found at The Daily Dish.