Some guy on a bike nearly crashed staring at me, why?

I was walking and some guy I've never seen before passed me by on a bike. He turned around and stared at me for quite a while. He nearly fell off his bike. Why would he do that? My first thought was he may have mistaken me for somebody he knew. But still a weird thing to stare like that. I don't think I look weird as to warrant being stared at.

Some guy on a bike nearly crashed staring at me, why?
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