Just in case you've been sitting up at night wondering how to describe that unusual sound in your S2000 to your Honda service advisor, here's an extensive list from their web site.

Vehicle Sounds
The following noises may help you in detailing your vehicle's condition to your listener.

Booming - rhythmic sound like a drum roll or distant thunder.
Buzzing - low-pitched vibration, similar to that of a bee.
Chattering - a clicking metallic noise that repeats rapidly.
Chirping - high-pitched noise similar to a bird.
Clicking - rhythmic tapping sound similar to that of a ball-point pen.
Clunking - a dull thumping, like something being dropped.
Grinding - a loud abrasive, metallic noise, often high-pitched.
Growling - low noise like that of an animal.
Humming - continuous noise which may be somewhat melodious.
Knocking - a banging noise with two objects hitting (heavy vs. light) one another.
Rattling - shaking sound, as if something is loose.
Rumbling - a low, gurgling noise.
Squeaking - high-pitched metallic sound, often continuous.
Squealing - high-pitched whine as if something is tearing.
Tapping - light hammering noise that can be rhythmic or intermittent.
Thud - low-pitched metallic thumping.
Thumping - a loud, banging sound.
Whining - high-pitched buzzing sound.

 

Both commonly found in cars with female passengers.