Imagine this scenario - a group of three would-be thieves enter a car dealer's lot. There's no one in sight and the office is closed, as the trio approaches the first row of cars, having cased the lot the day before. Suddenly, the speaker, overhead, comes to life. A thundering voice announces that the lot is now closed but is under video surveillance and asks visitors to return during regular business hours. The first thing that happens is that the individuals look up to where the voice is coming from, allowing the well-positioned camera to capture a good video clip of their face. The second thing the video captures is the three would-be thieves running off the lot.
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