One of the problems encountered with students who have been demostrated spinning before is that they are scared of spining. This i believe, is because they have been taught in the manner in which i was. That is, slow the aircraft down and near the stall, full elevator and full rudder..... the aircraft sort of flicks rapidly into a spin... thus scared student. Whilst teaching aerobatics, we taught a very controlled method into the spin which students were surprised at... and sometimes even enjoyed. This is because most wanna be airline pilot instructors dont know the first thing about spinning an aircraft... they only demostrate what the last wanna-be airline pilot taught them. More understanding of the art is needed from instuctor not just repeating the course notes..