We had one of these a few years back, the prof taking it was trying to emphasise the fantastic rate of change in the technology world, and as an example asked us to compare the car we drove to the meeting today with the one we had 5 years ago. At which point everyone turned and looked at me, and my boss piped up that I still drove the same car then as I do now. Ok, he says, there's always one, so think about the the car you drove 10 years ago, at which point there was deadly silence. Realising what was about to be said, he quickly changed it to 15 years ago, at which point the entire meeting descended into fits of laughter and the prof walked out. My car was then 17 years old and I'd had it from virtually new (but it DID have a digital speedo, and a crap voice synthesis box...).