They found an infection in my mom and were giving her antibiotics by IV drip pumped by one of those electrical pumps. When the bag was empty the alarm sounded. None of the nurses could hear the alarm go off because this guy was running the vacuum cleaner. This was no big deal, he was done soon.
But I was so fascinated by this. Audible alerts are traditionally used for urgent information in user interfaces. Weird that it would be undone by so simple an interaction with a common appliance. I wonder if they use them in the ICU?