Case analysis: When Mary, a British lady, first went to China a number of years ago, she had no idea about the Chinese language or its culture. Shortly after her arrival, she went to the bank on her way to school. She was extremely surprised when the bank clerk asked her if she had had lunch. Since she was a complete stranger, she was quite taken aback. She proceeded to school and was even more surprised when one of the teachers asked her the same question. Question: Why was Mary surprised?