My worst moment in 45 yrs of rotary flying was probably in Belize when flying in a Puma at 1000ft and 130 kts over the jungle, the best part of one set of tail rotor blade pockets decided to part company with the stainless leading edge. The vibration was incredible. Stuck it down in a swamp. Inspection showed the backend would have probably detached 30 seconds later, with the inevitable tent peg result. The 'cure ' was a 'tap test' to check other blades after every flight. Cured by introducing carbon fibre blades some time later.