First of all: I, too, aspire to Grand Prix dressage (you know, after years of training and hard, hard work on my dressage skills). My mare is older, but she has a "energetic streak" in her, especially if she gets fired up. We were riding in the hay field next to the pasture one day and the horse in the pasture came RUNNING up to the fence and my mare started "showing off" - first she bucked a few times (first time ever), and I immediately pulled her into a one-reined stop, as soon as I released her she started to bolt on me, and somehow (my mistake, I know) she started to do an unintentional piaffe. Seriously. Trotting right in place: even rhythm, TONS of impulsion. At the time I was caught between intrigued and terrified. But, essentially, between the two of us, we were faking it to make it because I was indicating "STOP RIGHT NOW" and she was just being stubborn, lol. There was no "training" going into the reason behind her movement. So, of course, A: I'm excited to know that my mare COULD potentially do that on command one day. and B: We have lots of steps between training level and grand prix to get to that point. haha. I guess my point being that: just because you and your horse have done certain dressage movements doesn't mean you are necessarily asking correctly, or even that your horse is actually doing it correctly, which indicates that unless you have a true DRESSAGE trainer working with your horse, people might be fiddling with her to try to "fake it till they make it", and not even know that is what they are doing.