Paul Gambaccini, the Professor of Pop.
Yep, the cultured one was in the audience at Wilton's Music Hall last night, with a loud-voiced young American (is there another kind) mate who was ranting about science and God in the interval.
I passed Paul on the upstairs landing, and (take note, Mark, Gina, Charlie) managed a friendly, knowing smile.
He did one of those "hi, i know you, how nice to see you again" eyebrow-smile faces. It's an interesting choice when celebs do that.
Cos they don't know you.
You just think you know them. It's never not weird.