At the beginning of the year a few years ago, DH asked me if I knew how much we'd spent on the pets the previous year. He's a numbers guy and tracks these things pretty much to the penny, so I knew he was attempting to open a conversation. And I had a pretty good idea of the figure. The pets had had a lot of medical issues, so we'd spent quite a lot. I gave him one of those wife looks I'm sure many of you know and said in my calmest, most serious and you-don't-won't-to-go-there voices: "No. And I don't care."
He's a smart guy. He hasn't mentioned it ever again. ;)