Remember when I went to the Campus shop, bought 4 bottles of Diet Vanilla Coke, and was mortified by the comment "Doing the office run, are we?"
I went in again later, and shuffled defensively to the till with a meagre two bottles. "I managed to get another two crates in - I think you're the only person who drinks it." Hurrah! As I said, they're nice people in the shop.