Breaking and Entering, err "Social Engineering" (Score 2, Interesting)

So 10 years ago I worked at a small ISP where the owner lived in a small apartment. In his apartment, he had a couple bonded ISDN lines that he then resold bandwidth off to a smaller business. Ever time the power went out (and the UPS ran out of juice), the ISDN equipment had to be manually reset for his and the customers lines to come back up. He went on vacation and of course the power went out. When I tried to get access to the apartment, the leasing company told me no, not without a signed letter allowing me access. I thought a bit, then rummaged around in his desk at work, found a contract he had signed, cut his signature out, taped it to a hastily typed letter saying I was allowed access to the apartment, and faxed it over to the complex. I then waited 30 seconds and called them up, saying he had just faxed it over to them and did they see it. They said "Yep, come over and get the keys" Made a couple copies before I gave them back. It was too easy.