Messing around with the vending machines

First you have to find a coke machine with an Led screen. Most of the time it says something like "ice cold drinks". All you need to know is on the machine the first 4 buttons for drinks. Starting from top to bottom it is from 1 to 9 I think. The code to enter the debug menu of the Coke machine is 4-2-3-1. Meaning if you press the buttons in that order you have accessed the menu. My favorite thing to do is to set the machine on error so people think its broken. Other than that you can't do much with out accessing the inside to set something on. You can see the internal temperature, see how much money is in the machine, make it look like it has an error. To use the menu you use the same buttons as before. 4 is enter, 3/2 are up/down, 1 is back. It goes back to normal if you hold the coin return button. Remember this is for educational purposes only.