“Hi, I’m in a bit of a peculiar situation. I’ve arranged to meet a group of total strangers at this pub tonight, and I don’t know what any of them look like. Seeing as you are a group of total strangers, I wonder if you are the group of total strangers that I am looking for?”
“No, sorry.”
“Ah, never mind.”
“Try downstairs.”
“Oh, there’s a downstairs? Splendid, I’ll give that a try.”