Right now my current beef is my father's fascination with the television. As long as he is home the TV is always on, and the volume is always "up" to the point you have to shout over the damn thing to be heard. When he gets up to go outside and walk the dogs the TV is left on, blatting away even if nobody is there to watch it. If I turn it off he turns it back on again as soon as he's inside -- which is his right, yes, because it's his TV and his house.
But still, I'm really getting tired of competing with the TV.