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. ;)