Please.
As has been hashed out here ad-nauseum, most of the planes people "spin" will recover spontaneously if you stop the control input which was required to get the plane into the condition in the first place (that is, let go of the yoke, relax on the rudder and pull the power)
As my esteemed colleague BEagle pointed out in his post though, a "real spin" is a condition which will continue in a metastable fashion unless active control inputs are made to recover. This recovery is not really intuitive, and is the reason why (IMHO) it's absolutely necessary that this training be included as part of basic pilot training. Several posters in this thread(myself included) have related stories about how they would be dead now (instead of just irritating to the rest of you who know obviously know everything) had we not been taught to recover from a fully developed spin.