How to start a conversation with a guy you’ve never talked to?

There’s this guy who i wanna talk to but i’d rather not go up to him and start a conversation out of nowhere. The two resorts i’ve came up with is 1) trip him and ask him if he’s okay or 2) tell him his backpacks opened which is also kinda desperate. any other suggestions?
How to start a conversation with a guy you’ve never talked to?
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