Never say "good day" in ED

The minute that I logged off, my ED (emergency department) was flooded immediately with patients, I had a patient who was DOA ( dead on arrival), an old man who had a hole on his neck can't breath, and one young man vomited fresh blood several times at home. And if it were not bad enough, one grandpa who was very pale and had tarry stools inside his pants....... Gee! I am not really a superstitious guy, but there are something you just don't want to say or do if working in ED. Saying " good day " is one of them. Well... From the other hand, I can always think in this way that hospital is not paying me just to sit in front of a monitor, typing my thoughts and not seeing real people and savin lives.