I had always heard that hitting a horse between the ears was a bad thing to
do also. (Actually, many years ago I broke a bone in my hand doing that on my
young sons very bad pony).
About 10 yrs. ago I had a gelding who would rear occasionally when he spooked
at something unseen in the bushes. One day he did that and hit a tree branch
right between the ears. Perfect timing... he never reared again and I had
nothing to do with it.