I recently heard of a corporate who, after 6pm, turn their building's elevators off to conserve electricity. IT unfortunately isn't a 9 to 5 job, so you can imagine how annoyed the staff must have been to learn that if they work late they have to walk the 9 flights of stairs to the ground.

Personally, I think it's pretty smart of the company to encourage their staff to work off the extra kilojoules added by the overtime-pizza run. :)