Dont forget the montego. OK, forget the montego. 
Ah bad memories.
I was driving down the outside lane of the M6 in a company one during my placement year at Alsthom in Stafford.
This dam Monte-no-go 2.0 estate which was then about five years old, had more rust than body work and tape around the screen, about 60K on the clock from memory
At 70 (cough) there was one HELL of a bang and the car jumped up followed by a screaming engine and stuff crashing on the underside of the floor pan.
I threw the left indicator on, looked towards the passenger wing mirror and could see nothing! A quick check of the rear view mirror and cars behind me were braking and swerving.
Glided it over to the hard shoulder and popped the bonnet.
At this point I discovered an engine which was very low on the passenger side, two drive shafts dragging on the floor along with a starter motor which was only just still attached to the positive lead. What was missing was the entire gearbox which shortly before expiring had dumped its oil down the passenger side of the car.
The M6 was closed shortly after to remove the lumps of gear casing, shafts and gears!
Scared the crap out of me!