Oh, no big deal, it's just a monkey buying himself a juice from a vending machine and remembering to return the change.
Aki the Capuchin monkey from Nihonmatsu, Japan inserts his coins into the vending machine, then bangs on it until a beverage is released. The monkey returns the change from the coin slot, and goes on to enjoy his drink. I also would like to note that he opens the bottle himself.
Capuchin monkeys are known for being the most intelligent of the New World monkeys and live in the tropical rain forests of Central and South America, and parts of Argentina and Mexico. They are often used in laboratories for various testing experiments.