CF,
between the Chinook and the Cormorant there was the Brent Spar in 1990 - S-61 clipped the crane jib with it's tail rotor (resulted in 6 fatalaties and 7 survivors.) I made reference to it in the thread about the CHC Dauphin (XD) in an attempt to highlight how potentially dangerous such an event was, but was poo-pooed for being melodramatic!