On 2005-09-17, Pat wrote:
Apparently this stuff has been around for a while but I only just found it.
And I laughed until I nearly choked!!

Airport PA announcement pranks:

http://ourpointlesslives.com/announcements/

Long years ago I was at O'Hare Airport, Chicago, in the small hours of
the morning when someone held a Laughing Bag to the PA mic. For those
who have forgotten, the Laughing Bag was a red cloth bag with a mechanical
device inside that made a raucous laughing noise when you picked it up.

Apparently you can still buy them: http://www.prankplace.com/laughbag.htm.

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The night is just the shadow of the Earth.