You think off the track thoroughbreds are crazy? Take a look at this! Horse vs Truck

Well.
I was sure thinking that my to mares would think this truck was very frightening, I couldn't have been more wrong!
I filmed because I expected them too run a bit and do funny noises that only horses can do when they don't know what to think about the situation. I was very satisfied and proud of them when when I realized that they didn't care much.
So all of you who is saying thoroughbreds are hot headed, overly energetic, what do you think about this?