This one is kind of stupid, but I live at home, and my mother will sometimes (okay, often) buy something while grocery shopping (lunch meat, salad, fruit, what-have-you), and then complain if it goes bad. "I bought this stuff, you didn't even eat it, and now I have to throw it away."
Not to sound ungrateful, but I don't ask her to buy that stuff, and I'm not always in the mood to eat it. When I can, I buy my own food, things that I would prefer to eat, and she'll click her tongue and say, "That's not very good for you." Hey, I'm 31 years old. I know. I also know that I'm tired of feeling like a sitting duck.
I think she just likes to have an excuse to complain.