Ok. I've had Magnum for six years. And for six years, we go through an itchy spell every spring where he will absolutely knock you flat on your rear end by trying to scratch his big, itchy head on you. I have NEVER allowed this and I'm strict with the students who ride him in lessons that they never allow it, either. I know it was allowed before I got him, but that was SIX YEARS AGO! What can I do to break him of this? I've got lesson kids afraid to lead him to the arena, lest he whack them in the face with his gigantic skull! HUMANS ARE NOT SCRATCHING POSTS!