Here's a great video that I've just come across thanks to Jacob Gardner. It's a clip from a French film called Moliere. The arty character is telling the older man to act like a horse, he goes straight into doing something pretty generic and thoughtless. The arty guy stops him and shows him the importance of knowing your character so that you can give the correct performance. Check it out, it's a great reminder of what we should and shouldn't be doing as animators.