Have you ever heard of "gurning?" Neither had I until recently. Apparently in England they have contests with people making the most grotesque faces possible through a horse's collar. Here is this year's winner.
Sometimes when Katrina screams we pretend like she is just in a gurning contest. :] Here she is with a scowl because she want to go to bed, which isn't very scary. However, some of her frowns right before she starts screaming...Yeah, those are pretty intimidating.