I teach computer courses, and my students often call me at home with questions. One morning I was on the phone, explaining in computer language the solution to a problem, while a repairman was fixing my refrigerator. After an endless stream of "C colon, back- slash, greater than, cd, backslash, DOS, 0 colon" and so on, I hung up and found the repairman staring at me. "Lady," he asked, are you a spy?"