Wrong adjective. I get uncomfortable if there are 20 people in a 30x20 room with me. A crowded elevator I can deal with so long as I can see that the walls aren't really pressing in on me, and I can still turn around and the take the stairs. In the dark, full of jostling people, I know that elevator is going to squeeze down size of a juice box.

Some people "know" that every airplane is going to crash and everyone will die. I "know" that elevators are really economy sized caskets.