Somehow this reminded me of the old `sound()` help file from Borland C++ 3.1. I think it was in dos.h.<p><a href="http:&#x2F;&#x2F;everything2.com&#x2F;title&#x2F;7+hertz+-+the+resonant+frequency+of+a+chicken%2527s+skull" rel="nofollow">http:&#x2F;&#x2F;everything2.com&#x2F;title&#x2F;7+hertz+-+the+resonant+frequenc...</a><p><pre><code>  &#x2F;* Emits a 7-Hz tone for 10 seconds.

        True story: 7 Hz is the resonant
        frequency of a chicken&#x27;s skull cavity.
        This was determined empirically in
        Australia, where a new factory
        generating 7-Hz tones was located too
        close to a chicken ranch: When the
        factory started up, all the chickens
        died.

        Your PC may not be able to emit a 7-Hz tone. *&#x2F;</code></pre>