“For improved pilot survivability the Ka-50 is fitted with a NPP Zvezda (transl. Star) K-37-800 ejection seat, which is a rare feature for a helicopter.[20] Before the rocket in the ejection seat deploys, the rotor blades are blown away by explosive charges in the rotor disc and the canopy is jettisoned.[21]”
http://en.wikipedia.org/wiki/Kamov_Ka-50
They had one of those in a James Bond movie, Goldeneye, IIRC. One of those, everything gotta work right, scenarios...