Follow these step by step instructions to learn how to hack a vending machine, giving you two Cokes for the price of one. You and your friends will love this cool vending machine con. Never go thirsty again. Just check out this instructional video and start hacking vending. Machines nowadays are SO smart that they know you haven't received your drink and give your money back. Humans nowadays are SO smart that we can make ourselves not receive drinks we paid for, get our money back, and then buy another one using the same money, and get TWO!