Coke Machine Hack....

Apparently the menu for coke machines is accessible by pushing the 4th, 2nd, 3rd, then 1st buttons on the display.

5572 comes up to let you know you're in.

Pushing the keys then comes up with ( I think ) a tally on the dispensed amounts.

Pushing the 5th button exits the menu.

There you go...impress girls, entertain drunk friends.

Video tutorial