A young teacher tried hard to meet and know the fathers and mothers of all her pupils. One day a man sat opposite her on a bus. She was sure that he was one of the fathers she had met.She smiled at him. She was surprised when he said, without a smile, "I don’t think I know you,young lady." She had made a mistake, and she quickly tried to explain. http://www.xue90.cn来自《幽默学英语》网
"Oh, I am very sorry. I was sure you were the father of one of my children."