A dear fellow working at Bristow/Teeside late 70's had a bit of "Unusaul Attitude" recovery practice one night departing a pumping station homeward bound from the Ekofisk. Seems the cabin attendant walked on the overhead for a bit. The aircraft had a major rebuild after severe damage was found to the swash plate knuckles that almost resulted in the loss of the p/c links.
They are tough birds!