What about the business cards with the phone company test line? The television show The Rockford Files , which was a series about a private investigator, illustrated a clever and somewhat humorous technique. Rockford (played by actor James Garner) had a portable business card printing machine in his car, which he used to print out a card appropriate to whatever the occasion called for. These days, a social engineer can get business cards printed in an hour at any copy store, or print them on a laser printer.