Really!? How on earth would that work in practice, and how would your deal with the sudden severe imbalance it would create? (putting aside the issue that dropping 20 tonnes of engine from the sky isn't a terribly good idea)
The aircraft would lurch violently to one side, alerting the pilots of a missing engine (until recently, the physical detachment of an engine was not alerted by any alarm in the cockpit. The aerodynamic behaviour of the aircraft would be the pilots’ first indication of a problem).
They would control the aircraft using the flight control surfaces with heavier rudder inputs to compensate for the single remaining engine on one side, which would - logically - attempt to make the aircraft turn in the air. Hard rudder in the opposite direction will bring the aircraft back on course.
Well, you did ask.............
Come on. It's another 6 weeks to go until April 1st
Engines fall do off unintentionally, of course
You mock but when an engine begins to disintegrate uncontrollably, it is better for the engine to detach and fall away. The position of the engines are usually such that it will cause minimal damage to the control surfaces if it does detach. It’s also one of the reasons why when engines are located on the back of the fuselage (not too common in new designs these days) the vertical stabiliser is a ‘T tail’.