I once had a call on my mobile from Microsoft whilst I was working at Microsoft! I asked him whether he was in the UK and he replied he was, I said is it Thames Valley Park and again the answer was yes. He rang off when I asked him which floor he was on so I could come and see him in person!
When I first retired I amused myself by keeping them on the line for as long as possible. My technophobe old man routine was the most successful - phone downstairs, PC upstairs: "hang on, I'll go up and do that for you" (long break) "sorry, what did you want me to type again?" I found 20 minutes was usually easily achievable. My wife got fed up with it though, now we have a call blocker that only lets through known numbers.
