Lol, they can be dangerous! We have never had any beginner horses on the farm, they are all intermediate to advanced rider horses that need more hours in the saddle, a confident rider, or like my horse, she's spooky and does stupid/dangerous things. I also go out and ride new horses that friends buy to see if they really are broke or not, I had one horse rear and flip over on it's back while I was on it. I jumped off and landed on my feet next to it on the ground. In 8 years of riding horses that aren't for beginners, I'd say that's not too bad, lol. My sister somersaulted with her horse because she was galloping through 6 foot tall grass, she was asking for that! She didn't get hurt other than breaking her thumbnail almost all the way off.