Most of my calls are from "Microsoft customer support" or BT. If the former it can be quite fun to troll them a bit since they're obvious scammers and can get quite agressive when they realise you've been having them on (they promised my wife once that "we have all your details including bank details so don't be surprised if your account is emptied tomorrow" before hanging up on her!).
I've had a few calls from them myself. The first time, I thanked them profusely for warning me, assured them that I'd get Tina from the I.T. Department to sort everything out and hung up. The second time, I told them not to worry, my computer runs Linux (half-true). The third time, I kept repeating "Are you sure? I had it checked this morning and there's nothing wrong." The fourth, I told them that "a friend" had a computer set up so that any remote access would trace the IP of the machine accessing it, hack into their photo record, and plaster a picture of the person doing so all over the internet, then hung up. There was no fifth.
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They invariably ask "how are you?", as a way of establishing rapport I suppose. This is a good opportunity to tell them how depressed you've been since the wife left two weeks ago, taking the kids and dog, and how you've been sitting sobbing in the dark ever since, and how wonderful it is that you finally have someone who cares to talk to about it.
This guy is the master at this sort of thing, very funny!
http://www.youtube.com/watch?v=-7OgWcwgB50
Epic!
