Pretty ingenius how these guys figured it out. It only works with the conveyor belt type coke machines. Basically you hold the door down while it tries to depense the coke. This tricks the machine into thinking that there wasn’t a coke on the conveyor belt when infact there was. Thus the next time you try and get a coke you get 2. Great! Watch the video for more details. Some of the ads on the page are NSFW.