No morbidity in this, but I was present when a 10 Hp DC motor coupled to a generator for a lab experiment had its field removed. The DC motor immediately increased it RPM from about the 3,600 it was at to around 15,000 in around 2 seconds. The room shook quite bad. If it wasn't for the professor hitting the emergency kill switch to the supply, the motor would hav blown apart causing massiv injuries to the people in the room. Not to many people realize how dangerous DC motors are if not properly controlled.
