http://en.wikipedia.org/wiki/Frank_Abagnale
"Abagnale's early confidence tricks included writing personal checks on his own overdrawn account. This, however, would work for only a limited time before the bank demanded payment, so he moved on to opening other accounts at different banks, eventually creating new identities to sustain this charade. Over time through experimentation, he developed different ways of defrauding banks, such as printing out his own almost-perfect copies of checks such as payroll checks, depositing them, and persuading banks to advance him cash on the basis of his account balances. Another trick he used was to print his account number on blank deposit slips and add them to the stack of real blank slips in the bank. This meant that the deposits written on those slips by bank customers entered his account rather than the accounts of the legitimate customers.[citation needed]
In a speech, Abagnale described an occasion when he noticed the location where airlines and car rental businesses, such as United Airlines and Hertz, would drop off their daily collections of money in a zip-up bag and then deposit them into a drop box on the airport premises. Using a security guard disguise he bought at a local costume shop, he put a sign over the box saying "Out of Service, Place deposits with security guard on duty" and collected money that way. Later he disclosed how he could not believe this idea had actually worked, stating with some astonishment: "How can a drop box be out of service?"[12]"