Good Lord. Just got another one of these calls. Was a bit brain dead from work, didn't feel like being very clever. But I think I pissed them off the most I have yet without even really trying.
Him: I'm calling about your windows computer.
Me: What windows computer?
Him: I'm calling about your windows computer. Are you in front of it?
Me: What windows computer?
Him: I'm calling about your windows computer.
Me: What windows computer?
<voice of someone else saying something like, "Tell him it's a-" and then cuts out, like he's got someone training him>
Him: I'm calling about your Microsoft windows computer.
Me: What Microsoft windows computer?
Him: Do you understand, I'm calling about your windows computer.
Me: Yes I understand. I'm asking you 'what windows computer?'. Do you understand the meaning of the word 'what'?
Him: I'm calling about your Windows 7 computer.
Me: What... Windows... 7... computer.
Him, very angrily: DON'T WASTE MY TIME YOU M#####F###ER!!!! HANG UP THE PHONE!!!
Me: What phone?
*click*