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An old man and a young man are walking in the park. The young man is behind the old man. There is a bench (长椅) in the front of the old man. The young man is very glad when he sees the bench. He wants to sit on the bench and have a short rest. He walks to the bench. He sees the old man walking up to it, too. So he begins to run. Now he is in front of the old man. The old man says, "Don't sit on the bench!" but the young man doesn't listen to him. He sits on it. He looks happy. The old man comes over to him with a sign in his hand. It says," Wet Paint".