Japan: Straight Sevens

There's a vending machine near our house that is the only one that has 500ml cans of Calpis. It also happens to be the only one with the "numbers bonus game". It goes like this:

• Buy any drink from the machine. In this case, 120 yen for Calpis Water.
• After the drink is dispensed, the numbers bonus game starts. Like slots, four numbers shuffle randomly. If you get 7777, you win a free drink of your choice.
  
• I got 7777! So for my free drink, I chose a 500ml can of Calpis Soda.

It was rather entertaining!