Just goes to show, should do your tests using 'live' sample data.
The English journal Computer Weekly revealed recently that a financial institution, sadly unnamed, has moved into the realm of personal abuse.
The institution decided to mass-mail 2000 of its richest customers, inviting them to buy extra services. One of its programmers wrote a program to search through the databases and select its customers automatically. He tested the program with an imaginary customer called Rich Bastard.
Unfortunately, an error resulted in all 2000 letters being addressed "Dear Rich Bastard". The luckless programmer was subsequently fired.