Some switch in my brain tripped, and the Do Not Interrupt Famous People While They Are Talking filter failed to engage. "But I've seen those!", I blurted out, and Harlan swung around to face me.

I've had that moment.

I call it "hindbrain borrows the car keys for the mouth without permission from the frontal lobe".

Though, I think, if you're going to do it to anyone, science fiction writers at a con are a good one. Fen are often loud and crass and unsocially skilled, and writers mostly started out as fen once, too.