Holding the prop
There was an unfortunate accident at LGW on one of IAS's Brits when the prop holder, sensing that the engine had started and the prop was not showing signs of moving, put his shoulder to it and shoved. The blade at the 3 o'clock position rapidly descended to the six o'clock position and promptly floored the poor unfortunate underneath the now burning and turning engine. Fotunately he was not killed but took a while to recover.
Cause was the rear turbine blades being stuck on the rear casing and by moving the prop freed the pent up energy thus accelerating the prop.
Sure, the Brit was slow, had a 'delicate' engine and the electrics could be a nightmare, but it was said that if you could master the electrics on it, no other a/c would be a challenge. Probably why the modern jet offers no challenges and leckies give up being aircraft engineers.