Inverted Spinning by accident
One thing that concerns me with spinning, is the amount of people that tell me that they 'fell into' an inverted spin. Whilst indeed it is possible to do, I have personally witnessed many pilots telling me that is what happened to them, when it was actually only an incipient erect spin. They seem to think that just because the aircraft briefly rolled inverted, that it was therefore an inverted spin. If they then try to recover with backstick, then they are in for a shock.
Such confusion helps explain why some people fail to recover from various spins - they don't properly identify the type of spin they are in. An inverted spin has a negative G pitching moment (ie seat belts floating in front of your face), yaw in the direction of spin, and rolling in the opposite direction. That in itself can cause massive confusion.
Such a shame that the majority of pilots don't experience both types of spins, with an aerobatic instructor.