According to a recent and unscientific national survey, smiling is something
everyone should do at least 6 times a day.  In an effort to increase the
national average (the US ranks third among the world's superpowers in
smiling), Xerox has instructed all personnel to be happy, effervescent, and
most importantly, to smile.  Xerox employees agree, and even feel strongly
that they can not only meet but surpass the national average...  except for
Tubby Ackerman.  But because Tubby does such a fine job of racing around
parking lots with a large butterfly net retrieving floating IC chips, Xerox
decided to give him a break.  If you see Tubby in a parking lot he may have
a sheepish grin.  This is where the expression, "Service with a slightly
sheepish grin" comes from.