I saw an ad on TV today that purported to highlight power savings by turning off lights - man, realising error, runs back up 20 floors to turn off a standard 60W (?) desk lamp. Unfortunately, to me at least, the message was rather lost by his initially travelling down (by himself) in an elevator - and would have returned the same way had not some granny beaten him to the car.

Alas I haven't (as of yet) been able to pin down the power consumption of a 6 - 8 person lift, but I would imagine it to be a little more than a 60W desk lamp. Perhaps not the best thought through advertisement.