Like High Fidelity, but in real life:
[While looking at vinyl copy of There's a Riot Goin' On]
Clerk: That's a great record.
Me: I know.
Because, really, when the music nerd gauntlet is thrown, what else can you say?
(The trip yielded Beggars Banquet and Sticky Fingers, as well as What's Going On?, Muswell Hillbillies, and Joni Mitchell's Blue. Slightly more expensive than last time, but I love those Rolling Stones albums and am willing to pay for them.)