Dragon rocks fall

We swung ropes around and into him, we picked up feet, we put things on his head, we waved things around... and I put two rocks on his back. My thought process was that many horses kinda jump if something unexpectedly falls beside them... especially if that small jump leads to another strange thing falling beside him. The pony wanted to stop and see what fell. Maybe he thought he could eat it. Anyways, I still haven't seen a fear response from this guy which hopefully means he doesn't have one or it is difficult to scare him. Either way, awesome. He was a great sport for us messing with him and he seemed to just soak up the attention. I really love this guy.