Sent to me by a friend:

When I was just a youngster Uncle John was in the
fertilized egg business. He had several hundred young
layers, called pullets, and eight roosters whose job
was to fertilize the eggs. My uncle kept records and any
rooster or pullet that did not perform well went into the
pot and was replaced.

Now this took an awful lot of time so my uncle got a set
of tiny bells, each with it's own distinctive ring, and attached
them to the roosters. Now he could sit and fill out his
efficiency reports by listening to the sound of the bells.

My uncle's favorite rooster was old Brewster. A very fine
specimen he was but his bell had not rung all morning.
Uncle John went to investigate. Several roosters were
chasing pullets, bells a-ringing. Brewster had his bell in
his beak so it couldn't ring. He'd sneak up to a pullet, do
his job and walk on to the next one. Uncle John was so
proud that he entered him into the county fair. Brewster
was an overnight sensation.
The judges not only awarded Brewster the No Bell Prize but
the Pullet Surprise as well.