Placebo Buttons

David McRaney advertises his new book, "You are now less dumb" through an excellent post.
It starts with
"The Misconception: All buttons placed around you do your bidding.
The Truth: Many public buttons are only there to comfort you."

"According to a 2008 article in the New Yorker, close buttons don’t close the elevator doors in many elevators built in the United States since the 1990s. In some elevators the button is there for workers and emergency personnel to use, and it only works with a key. The key-only settings isn’t always active though, as the blog Design with Intent asserts. Each elevator is different. In some, the emergency function requires a long-press of several seconds longer than the average user attempts. The website, The Straight Dope, investigated the issue in 1986 by asking elevator companies and elevator repairmen directly. According to their investigation, “The grim truth is that a significant percentage of the close-door buttons in this world…don’t do anything at all.” The reasons cited were that the button was never wired up, or that it was set to a delay, or was deactivated by the owner, or it broke long ago and no one ever complained because the doors eventually close whether or not you press the buttons."

I also really like that one:

"In many offices and cubicle farms, the thermostat on the wall isn’t connected to anything. Landlords, engineers and HVAC specialists have installed dummy thermostats for decades to keep people from costing companies money by constantly adjusting the temperature. According to a 2003 article in the Wall Street Journal, one HVAC specialist surmised that 90 percent of all office thermostats are fake (others say it’s more like 2 percent). Some companies even install noise generators to complete the illusion after you turn the knob.

In a survey conducted in 2003 by the Air-Conditioning, Heating and Refrigeration News, 72 percent of respondents admitted to installing dummy thermostats.

    “We had an employee that always complained of being hot,” recalls Greg Perakes, an HVACR instructor in Tennessee. “Our solution was to install a pneumatic thermostat. We ran the main air line to it inside of an enclosed I-beam. Then we just attached a short piece of tubing to the branch outlet (terminating inside the I-beam without being attached to any valves, etc.).”

    The worker “could adjust her own temperature whenever she felt the need,” Perakes says, “thus enabling her to work more and complain less. When she heard the hissing air coming from inside the I-beam, she felt in control. We never heard another word about the situation from her again. Case solved.”

    - The Air-Conditioning, Heating & Refrigeration News, Mar. 27, 2003"