Some time ago there was an advert for, I believe, water filtration of one kind or another, in which a woman of unblemished skin and calm disposition brews herself a cup of enticingly translucent tea in a glass cup, using said water. Her equally impeccable husband, looking on jealously at her newly-steeped beverage says admiringly, "That's a lovely cup of tea". To which she archly replies, "Wrong again! It's my lovely cup of tea." (I cannot now remember the male partner's first inaccuracy that made him wrong for the second time - presumably some wrong-headed assumption about water filtration.)