Whats the most spontaneous way youve ever met someone for a fun, no-pressure hangout?

I was scrolling through old photos the other day and realized half my best memories involve people I barely knew before that daysomeones random suggestion, a last-minute invite, or just striking up a chat with a stranger. How do you usually find yourself in those kinds of situations, or do they just happen by accident?
 
 
 
 
 
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