Never say no if they then begrudgingly ask you if you want a cup of tea, even if you don't want one, because you will then be accused of carrying the row on!!
bigmamma I guess it depends who say it, if I say it, it means that I am right and cant be bothered argueing any more, if he says it, its cos he is wrong, he knows he is wrong, I know he is wrong and he knows I know he is wrong and I know he knows I know he is wrong! ( Ta dah - and that is why I always win arguments, he just gives up after that!)