Two little mice fell in a bucket of cream. The first mouse quickly gave up and drowned. The second mouse, wouldn't quit. He struggled so hard that eventually he churned that cream into butter and crawled out.
Two more mice fell into another bucket. One swam to the edge and watched the other struggle until he died, never realizing that he could not churn water into butter.
Note: credit to the big famous movie for the first half of the story:
http://www.imdb.com/title/tt0264464/quotes
