Reaching to remove the patient's tourniquet late one night, I paused for a moment as the lights began to flicker. Next came the sudden BANG of the fire doors slamming shut in unison, only to be followed by the slow creaking sound as the opened themselves up again. Fluorescent lighting tubes sizzled as the continued to flicker, monitor alarms rang loudly before suddenly silencing and going blank, fire doors opened and closed themselves at will...
Had the ghosts of patients past come back to haunt the ER, as my patient suggested?
Either that, or engineering was testing the backup generators.
Besides, we're already haunted by prior patients - we just call them frequent fliers, not ghosts.