I know I've "accomplished" something similair in G2 But I was learning how to take off & hover at the time. So I don't think it was actually:

Helicopter Dynamic Rollover


An increasing percentage of helicopter accidents are being attributed to dynamic rollover, a phenomenon that will, without immediate corrective action, result in destruction of the helicopter and possible serious injury. We hope this artical will inform helicopter flightcrews of the cause of helicopter dynamic rollover and measures to take to prevent such occurrences.

Helicopter pilots in general are required to be skillful in operations on both improved or unimproved surfaces. During normal or slope takeoffs and landings with same degree of bank angle or side drift with one skid/wheel on the ground, the bank angle or side drift can place the helicopter in a situation where it is pivoting (rolling) about a skid/wheel which is still in contact with the ground. When this happens, lateral cyclic control response becomes more sluggish and less effective than for a free hovering helicopter. Consequently, if a roll rate is permitted to develop, a critical bank angle (the angle between the helicopter and the horizon) may be reached where roll cannot be corrected, even with full lateral cyclic, and the helicopter will roll over onto its side. As the roll rate increases, the angle at which recovery is still possible is significantly reduced. The critical rollover angle is also reduced.

The critical rollover angle is further reduced under the following conditions:
a. Right side skid down condition
b. Crosswinds
c. Lateral center of gravity offset
d. Main rotor thrust almost equal to helicopter weight and
e. Left yaw inputs.

When certain elements of helicopter operations are at or near their most critical condition, such as high gross weight, right lateral center of gravity, crosswind from the left, hovering with only the right skid/wheel in contact with the surface and with thrust (lift) approximately equal to the weight, very little right roll rate is correctable for any given bank angle.

Info from:http://www.helicoptersonly.com/