On each banknote there was a message, saying that they can lose money too someday. And they should use 'Green card' not to face this problem. This happened to be a great motivation to start a new bank product too.

So, in both cases if people were honest and gave money back, and if they preferred to keep lost money - they received a direct brand message.

Results:

$1,500 cash invested into non-cash shopping.

Thousands of mall visitors participated in this trick.

Brand awareness increased by 38%.

Selling of credit cards increased by 112%.