I saw Mary do a stunt I have seen a male pilot. It was at an airshow in Cocoa Fl. She took her Pitts Special and proceeded to a full vertical climb until it stalled. Maintaining her vertical position she went into a tailslide until she picked enough negative airspeed where then snapped that Pitts into negative aileron rolls. Damndest thing I ever saw and even Bob Hoover did not attempt this maneuver.