I remember a flight with the Chief Pilot as Captain, suddenly starting the left engine without the ground clearance and a Mekanik was standing before the engine, happily no accident but the Mekanik was very very angry. I (F/O) was terrified to see the Captain being in a hurry and doing such a dangerous action without to feel culprit nor excuse.
I did wonder how many many pilots did not respect the Mekaniks and ground Crews.