Great concept. Something so simple, yet so powerful. Accurately predict the outcome of an upcoming
event. The method is pretty simple but you're kind of forced to go out of your way to find a
mailbox. If you live near one then it's great. The best part is, that your friend watches you write
their address down, and he or she is the one that puts it in the mailbox. A few days later, they
receive the letter with an accurate prediction. Great effect.