There was a Wessex bingled on the tie down pad at Culdrose around 1970 or so, when the machine developed ground resonance whilst chained to pad. The pilot wasn't wearing his bone dome (tie down, no need.....) and was knocked unconscious when the HAS1 rolled on it's side, still turning with the stubs of the blades imitating a rotary hoe.
Eventually the fireys turned up and stopped the donk by squirting foam through the intake, then the driver was whisked away to sick bay and about 6 month's convalescent leave. Salutary lesson for most of us at the time.
However, in the bold world of commercial aviation, there's a time and place for everything, and sometimes flying VIP's in twin engine air conditioned comfort, with the old bars gleaming on a clean white shirt, isn't always a good time to put on a bone dome.
Down in the weeds chasing a car on a film job, slinging foam at a bush fire, lifting loads onto a city roof; definitely a hard hat job.
Horses for courses.