I think I figured out elevators.
No, I'm not crazy. At least, I don't think I am.
Here's the deal. I've noticed that when an elevator is going up, it dings once when the door opens, and when it's going down, it dings twice when the door opens. Is this an ADA thing? Well, if I'm right, then if I ever go blind I'll know which direction I"m heading in when I step on to an elevator.