Or would, if you let it? Things that you think of as perfectly normal behaviour, but aren't, according to Mumsnet. The two that spring to mind are offering someone a lift-surely not doing so is the "bad option"? And using another close family member's towel. Oh, and washing your hands in the kitchen sink. There are loads. I'm not going anywhere near who is allowed to use your loo for what-that's too scary.