Given the question "Where was the witness?" and the answer "At a bus stop.", write a conversation that might have happened.
M: Hi, Mum.W: There you are. I'm getting worried. It's so late.M: Yes. I ran into Linda and we went to a pub. She told me a funny thing.W: Oh? What was that?M: Well, she was driving home after work, and she suddenly saw an old lady on her hands and knees in the middle of the road.W: Really?M: Yes, Linda was so shocked that she stopped suddenly and the car behind crashed into hers.W: Was her hurt?M: No.W: And what was the old lady doing?M: I am just coming to that. So Linda got out of her car and saw the old lady pick up something and walk away.W: Lucky indeed. Linda didn't run her over.M: Then a policeman came. But he didn't believe what Linda said.W: Well...M: Luckily there was a witness, a man waiting for a bus. He saw it all. Guess what the old lady was doing?W: I haven't the slightest idea.M: She was looking for her gold tooth.W: A gold tooth?M: Yes, it fell out as she was crossing the road. The witness heard her saying, "Oh, my gold tooth..."