Hens are Supposed to be Quiet, Right?

Our hens are pretty quiet overall, but our leghorn makes a tremendous amount of noise after laying an egg. It’s loud enough that we can hear it from inside the house. I’m not sure if this is a breed or individual characteristic. Are any of your hens noisier than others?

I finally managed to capture her on video. So here’s Boo, singing loudly after laying. ¬†Switch to 720p HD for best quality.