Just so you know, if you get into the elevator and accidentally press the wrong button, you have to explain that in fact there's no emergency, you're just an idiot who doesn't know how to use an elevator. It's even more embarrassing when it's an elevator that's in the building that you work at, one that you use...well, not every day, but every time you're carrying way too much or not physically up to scratch. And you know, all the buttons in the darn elevator are shaped the same, and if you don't know braille, well, you're SOL if you push one without looking, hoping to hold the door open for the people hurrying after you.
So I had to explain to the man behind the elevator panel that we were not trapped in the elevator, didn't need his help, and were in fact enjoying our ride to the second floor even as he spoke to us. He said, in a voice that sounded almost genuine, that he was glad there was no emergency.
If the button were as red as my face was by the end of that elevator trip, probably a lot fewer people would think it was the "door open" button.