A man with a very heavy Indian accent said he was from Microsoft and they (microsoft) were receiving "error" reports from my computer, so he asked me to go to my computer and press the control and the microsoft button at the same time, etc...
I played along for a little while just to see where this going, (without pressing any buttons) and then told him I wasn't a fool and could see right through his scam. He hung-up on me immediately.