Two friends, one an Optimist and the other a Pessimist could never
quite agree on any topic of discussion. One day the Optimist decided
he had found a good way to pull his Pessimistic friend out of his
continual Pessimistic way of thinking. The Optimist owned a hunting
dog that could walk on water. His plan? Take the Pessimist and the
dog out duck hunting in a boat.

They got out into the middle of the lake, and the Optimist shot down
a duck. The dog immediately walked out across the water, retrieved
the duck, and walked back to the boat.

The Optimist looked at his Pessimistic friend and said, "What do you
think about that?"

The Pessimist replied, "That dog can't swim, can he?"