I want to note that if I have an open can of soda when I'm hanging out at a bar or restaurant I will still order a soda from them because that's the implicit agreement for taking up chair space
At Worldcon, I literally recognized GRRM because he was a chubby old guy with suspenders sitting in the hotel lobby. (And a cap that said "Fiction" 🤣) Also recognized John Scalzi from the escalator because of a) small bald spot and b) walking around with a can of soda near the bar. :)