What is the weirdest interaction you’ve had with a stranger?

I live somewhere sunny in the USA, and a woman stops and stares at me in absolute disbelief. She says, "ericxjo??? Is that you???". At this point I'm very confused because my name is neither common nor rare, but she clearly knew me and my name. I totally forgot, as far as I knew, who this was. Must have been someone who knew me very well, the way she was looking at me. "I thought you were in Australia!!" (at that point in my life, I had never been to Australia). So I said, "um, no, I'm here..." and we start to talk and she sits down. I'm a bit worried about her so I sit down too, she looks, well... concerned and shocked. After a little while, she finally realizes that she doesn't know me after all. It turns out that she mistook me for her SON, who lives in Australia. She showed me pictures of him. Might as well have been me. There was no difference at all, it was like I was looking at a picture of myself. I joked that we should call him (I was seriously wondering if he sounded like me). His mother also mentioned that we had the exact same mannerisms and walking style. She also admitted at first she thought I was her son putting on a fake accent...

So I've never met my doppelgänger, but I met his mom!