The only videoed spin accidents i've ever seen envolved spinning in from low level aeros or steep climb out showing off (this was going the rounds at the CAA safety evenings). The only other occasion was spinning in from a turn back efato.
I always remembered spinning was dropped from the UK syllabus after few Tomahawk accidents, think they occured at Oxford.
When i learnt in the late 70's on PA28's can remember doing several with my examiner has he wanted to satify himself i could do them. Great fun as the Cherokee would flick roll before it entered a spin!