In 1993, four executives from a Florida rental car company were convicted and jailed for defrauding their customers. Using what con artists have long referred to as a “salami technique” (you slice off tiny pieces in hopes that no one will notice and that those little pieces will build up to a large amount of money over time), they cheated at least 47,000 customers over a four-year period. They had modified the computer billing software to overstate the size of the gas tanks on the cars.