It's interesting that in the heat of the moment calls can revert to simulator practice eg. Speedbird zero three eight declared the emergency as 'Speedbird Nine Five' which, I am told, was a simulator exercise callsign. As pilot I suffered an engine failure resulting in, oddly enough, a 'Speedbird 038'-type incident, yet instead of calling Mayday I unwittingly reverted to day-job ATCO-mode and transmitted 'Aircraft Accident, zero eight undershoot'. Nevertheless it had the desired effect.