Pinched this one from the Navy Stokers site...

I had a phone conversation today with a very nice young chap from Pakistan. This is how it went:
"Hello sir, how are you today?"
"I'm very well, thank you for asking. And how are you? And, more to the point, WHO are you?"
"Sir, my name is Sanjit, and I'm calling you from Microsoft".
"Microsoft, eh? Is that a city in Pakistan? How's the weather there today?"
" No, sir - MICROSOFT, the computer company. I'm calling to tell you that we have found a problem with your computer and -"
"REALLY?? Well, that's quite concerning......"
"Yes sir, it can become very serious indeed, but thankfully I will be able to fix it for you. Now, if you -"
"No, I meant it's very concerning because you see I don't HAVE a computer".
"You don't?"
"I don't".
"Ahh, it must be a problem on your laptop sir -"
"Don't have one".
"Ipad?"
"Nope".
"Tablet?"
"Nope, I have none of those things. As a matter of fact, I don't even have a telephone".
After a few seconds of silence he said "Ah, sir, you are lying to me now!"
I said "Well, you started it!!" and put the phone down.