Yeah, I did a small horror short a few years back and the last scene had a girl screaming at the top of her lungs, it was amusing to say the least. To be honest, as silly as this sounds, try to get her to practice screaming without screeching or squealing. That might be what makes it amusing. I'm just speaking from experience on my previous short...after watching the dvd years later I was simply annoyed with her persistent scream because it was just so screechy. And it's amusing to see her scream at a fake threat. Good luck though!