I remember a chief pilot challenging me to a 'practiced forced landing/glide approach' in a chieftain for fun
There were tales of chaps doing something similar on the Electra HBA-LST on the Sunday morning paper runs. (Certainly couldn't have involved me ...).
Aim was to climb to whatever height, nil cruise - just push over into the descent, idle power, and juggle speeds and configuration until the minimum specified for spin up ... no point risking one's job for a bit of fun. Certainly kept the thought processes spinning along throughout the descent.