 "'Microsoft? Is that a city in Pakistan?' "'No, ma'am. Microsoft, the computer company. I'm calling to tell you we have found a problem with your computer.' "'Really? That's quite concerning.' "'Yes, madam. It can become very serious indeed, but thankfully I will be able to fix it for you.' "'No, I meant it's very concerning because I don't have a computer.' "'You don't?' "'No.' "'Oh, must be a problem on your laptop, madam. I don't have one.'