Plus the fact that the thing isn't gone forever just because you ignore it. It obviously shows up often enough that the other nurses can tell what happened just from the first nurses face.
Can you imagine working in a place, every day, where that thing is lurking about? I wonder how many nurses quit from that place? How many got committed because they insisted on seeing it? How many couldn't take it any more and killed themselves?
Maybe it is just a lost soul and would disappear if someone did pick it up (only everyone is too chicken to be the first to try it), or maybe they ignore it because of what happened to the last person who tried to pick it up...