Elevator control panels have long featured two buttons labeled “door open” and “door close.” One of these buttons does pretty much what it says on the label (although I understand that European elevators sometimes have a separate “door hold” button for the most common use of “door open“). The other usually doesn’t seem to, and that has lead to a minor internet phenomenon. Here’s the problem: the internet is wrong, and I am here to set it right.

source: HN