One of the earliest visits- MIL helped paint our living room. When she left she said "At least now I know my grandchild will have ONE clean room to play in!" WTF?!?! Granted, I'm not Mr. Clean, but I didn't deserve THAT!!
That is how our relationship has always been- she makes little comments on the way that I do things (how I raise my kids, run the house, live my life).