I've just remembered a very strange girl who we had to dinner once. We handed out sherry beforehand (this was in the 1970s) and poured wine with the meal. She never said just "no thanks" - she took the but left it standing, and then started to rant about drinking alcohol when we poured the wine.
We would have thought nothing of her saying "no thank you, I don't drink alcohol" (which would have saved us wasting that glass of sherry) but she made such a drama of it, as if she was expecting us to pin her down and pour it in her mouth.