How do you start talking to someone you don't know?

I was just wondering how you would start a conversation with someone you've never spoken to before and have no current classes with them. I know this sounds weird but I keep seeing this dude around college and I wanna start talking to him but I don't know how without sounding weird! We both know who each other are but never actually spoken before.
How do you start talking to someone you don't know?
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