The 1980 Pennsylvania Lottery scandal, colloquially known as the Triple Six Fix, was a plot to rig the Daily Number, a three digit game the Pennsylvania Lottery offers. All of the balls except 4 and 6 were weighted, meaning that the drawing was almost sure to be a combination of only 4s and 6s. The scheme was successful in that 666, an expected result, was drawn on April 24, 1980; however, the unusual betting patterns alerted authorities to the matter. The chief conspirators were sent to prison, and most of the fraudulently acquired winnings were never paid out.

• http://en.wikipedia.org/wiki/1980 Pennsylvania Lottery scandal