Do strange people attract more strange people?

Beijing, China

A guy bumped into me in the restaurant today while I was having dinner with a friend. As I turned to face him a tall, lanky young Chinese man bent down to my sitting level. His clothing looked old, a bit worn maybe, together with his hair shaved at the neck but longer at the top it gave him the appearance of a punk. Not entirely pleasant, especially because when he started talking to me it became obvious that a) he might be drunk or stoned and b) a lot of his teeth were missing. I'm used to random people here trying to talk to me because I'm a foreigner, so I indulged him.
"You're a foreigner", he said in quite good English. "Yes", I answered patiently.
"Deutsch", he shot at me. That had me impressed. Few people ever mention Germany when they try to guess my nationality.
"You are from Munchen", he continued. No. "Frankfurt?" No. "Bonn." Yes, more impressed this time. That was another first. Few people here even know Bonn exists. "When Germany was apart Bonn was the Western capital", he proceeded to explain.
"I know one German rock band", he then announced. This time I actually played along, interested now. "Which one?" "Rammstein." He rolled the r like a Prussian. Wow! He knew even them. He went on to name several of their songs. His German pronunciation was quite good, too.
Then he turned to my friend. "Are you Chinese", he asked in Chinese. She gave me an exasperated look. That happens a lot - she is from Chinese background but not nationality. Hardly anyone gets her nationality right. She shook her head. "Japanese", he continued in English again. No. "Korean?" Those are the usual guesses. Then he changed course: "Malaysian?" No. But now I was curious, so I encouraged him to try again. "Indonesia?" Correct.
"Then you're catholic", he shot at her, "praise God." That was yet another surprise: very few people know that the Chinese minority in Indonesia is largely catholic.
Shortly afterwards he excused himself. "Auf Wiedersehen", he said, again in quite clear German, gave us another toothless smile and left. My friend relaxed.
At first, I didn't think much of it but then she said to me: "That was scary. How could he just guess all these things?" That had me thinking. For the rundown punk he appeared to be his education seemed very good. He spoke quite good English and some German. He knew about a lot of unusual random facts. Also, he seemed incredibly good at guessing things about us. It reminded of things, stories about psychics who just by a look or a touch will know things about you, receive a short insight into your mind. Now, this guy could just have been some crazy punk, alcoholic, homeless; and surely in the 1.5 billion people here there has to be someone who likes Rammstein and is able to guess my nationality. But right there, right then? A less than usual nationality correct at the first try, an unusual, hardly known hometown correct after only two wrong attempts, a band that happens to be my favourite. And the facts about my friend, as well. Thinking about it now it feels not so much as if he was guessing but rather working his way to the truth. Believe in it or not but that conversation now seems very surreal. Even among other strange encounters this one was certainly unique. Just think, what if ...