I got a call yesterday afternoon about a problem on my computer. I listened to what they had to say and then informed them that I work in IT and know that there is no possible way that they could know that there is a problem on my computer. The man still tried to convince me until I said that it is my job to know these things and there is no way they could know, at which point he hung up on me. I don't work in IT and don't know a lot about computers, but it seemed to work! It worked in the evening when they called a second time too!