On Thu, 6 Dec 2007 16:23:15 -0800 (PST), Dottie
wrote:

My house has two outside faucets. One on the north side, where the
water line comes in to the house, is fine. The other one is on the
south side....right under the bathroom window. All the faucets in
that bathroom are fine, no noise. The outside faucet makes a jarring
racket that can be heard all over the house. Why? Is there anything
I can do? I know that air in the line can cause it - it's a vibration
type noise....but why just that faucet?

Sounds like an anti siphon valve. Do you have one on the outside hose
bib?