I have had a few in my time:
One was yesterday. I was riding my little mare on the road for the first time, going at a slow walk, with a red vest tied onto her saddle, a red ribbon on her tail, and a sign sticking up from the back of my saddle, that said "Aggressive horse! Please watch out!" because she is easily angered, and has a bad temper. Traffic was going pretty good, when a four wheeler pulled up. He was going slow beside me, not revving his engine or nothing, when he said ; "Nice horse, does she bite?" By then, she was getting fed up with the constant rumble of the bike, and was nipping at it. When I said "yes, she does." he looked at me like I was the one trying to bite him, revved his engine, sprayed dirt at us, and parked up the road to WATCH. She reared up, throwing me off, and landed on her back, just missing me. So, while she was freaking out on the road, with me trying to calm her down, and see if she hurt herself, he was laughing! I just wanted to slap him!
Another time is when I rode my neighbors stallion in a parade. He said that he wiped his nose down with Vixx, to mask the cent of the mares. Well, rather he didn't, or didn't put enough. Rud was fine until halfway through the Canada day parade.I had him dressed up, with a flag on each side. Well, he got wind of a mare that was in full heat, and stood up, I leaned forward, and he went back down. Then, he took off at a full gallop through the parade. I could not get him under control no matter what I tried. I looked up, to see where he was going, only to see that he was running toward a hot dog seller, with a bunch of kids standing around. I didn't want any one to get hurt, so I threw myself off, grabbing the halter under his bridle. I pulled him to the ground, stopping him. But, in doing so, I popped my shoulder, and dislocated my elbow, and he fell on me, snapping my ankle.