Once upon a time there was a fox strolling through the woods. He came upon a grape orchard. There he found a bunch of beautiful grapes hanging from a high branch.

"Boy those sure would be tasty," he thought to himself. He backed up and took a running start, and jumped. He did not get high enough. He went back to his starting spot and tried again. He almost got high enough this time, but not quite. He tried and tried, again and again, but just couldn't get high enough to grab the grapes.

Finally, he gave up. As he walked away, he put his nose in the air and said: "I am sure those grapes are sour."