Today at the salad bar, I tried to convince the salad-maker that she did, indeed, have balsamic vinegar or vinaigrette.

her: What salad dressing?
me: Balsamic vinaigrette.
her: Sorry, no balsamic vinaigrette or vinegar today.
me: Oh.
her: What would you like instead?
me: Do you have balsamic vinegar?
her: No, sorry.
me: Balsamic vinaigrette?
her: No, just red wine vinaigrette. Would you like that instead?
me: No.