A source of continuous irritation: the elevators. Press the upper button with the triangle pointing upwards if you want to catch an elevator to go up. Press the lower button with the triangle pointing downwards if you want to catch an elevator to go down. It is really surprising to see how many people always press both buttons because "the elevator comes faster that way". That is true of course. Instead of catching an elevator that goes up or goes down, you catch them both. But what is the point of catching an elevator that is going up if you want to go down? That wouldn't even bother me, people are allowed to waste their time as they see fit, but that is not what happens. The elevator opens, they see the light inside the elevator pointing in the wrong direction and then sigh and wait for an elevator that goes in the right direction, thus having wasted the time of the people in the elevator and in the end, their own time, since making needless stops only slows the whole system down. How bright does one have to be to understand this, or how dim not to understand it?