Hold your horses
There are two types of people in the world: the trouble makers and the ones who clean up their messes. In a similar way, there are two types of horses in the stable; the crazy one and the relaxed one. In this case, you can clearly tell which one is which.
Perhaps it’s no coincidence that one is more energetic and one seems tired; perhaps the smiling one is the young horse, and the tired one is the older horse, the one’s who already seen everything, and now he’s ready for his golden years. We don’t know hoe much peace and quiet he’s going to have, though, with the younger horse in the stable next to him.