The Story of the Fisherman

Once upon a time there was a lame duck fisher. One day he went to a sea and started fishing. He set a net in the water. For the first time there were no fish in a net; for the second time he caught a dead donkey, which drown in a sea; for the third time he caught a lot of rubbish. He thought that there was no hope to catch any fish, but he decided to set a net the last time. When he started to tug the net back, he found the strange jar. What was it? What did it contain? Read the story to know!