We know that coins can be used to play a prank on others by squirting water, but here is something much more serious. It allows you to store precious information within without giving the game away. Do you have a microSD memory card containing risqué images of your weekend that you do not want anyone else to see, ever? Well, store it within the Hollow Spy Coin, of course! You can use it as a form of currency without being detected or charged for fraud, although that wouldn’t make real financial sense since the nickel alone will cost $30.