last weekend 14/15 September, at a clubday of the dutch LEGO club "de bouwsteen" I saw this real nice demo.
A story about "The duck family and the bad rat".
The lady in the white designed and build the duck
the duck wonders around and when it finds its nest, it will lay an egg.
the rat is stealing the egg form the nest.
the small ducks have PF motors and are remote controlled.
more info: http://mocpages.com/moc.php/220755