Hahaha on the contrary, I have an Arabian/Quarter horse who is the most anxious, spooky, hot headed horse I've ever, EVER met. He's so frustrating, but he's my baby.
Phillip has the attitude of a two year old, he throws tantrums when he doesn't get what he wants, trips over hi feet, speedy/spooky almost every time I ride/work with him. Although - he can take things in stride if he understands. He is the most intelligent horse I've ever owned. He gets bored extremely easy, and is constantly moving, or doing something. I would own another Arabian after him, and I would only lease him to a rider that can handle him. In the last two years, 5 people have ridden him. My mom (twice), some teenager (who fell off at a gallop - bareback), my cousin (leadline bareback), a friend (who also fell off) ad myself. He doesn't like new people or beginners on him. Well now I'm rambling. Just look into the particular horse BEFORE you buy.