The pics and videos pretty much say it all...
Human, you look weird.
But maybe you have foodz?
...but not as interesting as the lady with the hay cart over there.
Note that usually the clinking noise is what worries horses the most about armor, which is why you hear so much of it in the vids.
This one is my favorite. Brego's all "Oh hi, what exactly are you doing and can I eat it?"
So yes, we're pretty sure Brego will be able to add "kick-ass jousting horse" to his resume in fairly short order!