We issue products at a window in our blood bank with a clearly visible doorbell in case no one happens to be in the room. Everyone in the hospital found a way to simply ring the bell if they needed us, except for one nurse. She would come to the window and whistle... dog whistle. Yes, she would come and whistle for one of us to come and take care of her. We would ask her to just ring the bell and the next time... whistle. The last time she did it was when I happened to be in the next room, heard it, saw two techs prepare to go fetch, and told them that when they started drinking their water out of a bowl, they could go when she whistled. Well what do you know, she walked into the next room and I calmly looked up, feigned surprise, and asked her if we could help her. That was the last time I heard her whistle. P.S. Rumor has it that she got fired for flashing a patient. Not sure if it is true or not, but honestly I would not be surprised.