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I read online somewhere the instructions for hacking a soda vending machine by pressing the buttons in a certain sequence. Think of the button layout as a keypad. If you enter different sequences, you can do all sorts of things like change the pricing of the cans, including changing the price to zero. Changing (or maybe just checking) the temperature of the machine. Accessing sales statisitics in the small LED screen. Etc. Etc.
I tried it out on a machine at work, and it actually works. I didn't steal any soda, and I reset the machine to how I found it, but I thought it was interesting.
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