No stranger has ever started a conversation with me, except for old people. Old people seem to be the only people that do it. And even most of them don't. The thought of it is really weird...
I've started doing it recently, though. People stare at you a lot in England, everyone stares at everyone, it's really weird. Recently when people stare at me I've started like nodding at them or even saying hi. It's an involuntary thing. They just start staring at me and it's weird and I can't help but greet them, my friends think it's hilarious.
This shows just how weird it is here to greet people you don't know on the street - me and my friends sometimes do it to have a laugh. Like saying hi to people on the street you don't know is so weird here we do it just to freak people out.