[User23]

My brother did civil war reenacting pretty seriously (he had a bit part as a union soldier running across the battlefield and getting shot dead in the film Gettysburg, among other things) and he told me that a horse would get spooked by a coffee mug if it hadn't seen one before.

It gives you a whole new appreciation for HEMA and what it took to train destriers.

[travisjungroth]

I guess the utility of a novel thing to a herd, prey, plains animal is mostly likely about zero. The danger of the thing is higher.

[BeFlatXIII]

Horses also need to be desensitized to new objects twice: once on their right eye and once for their left.