If you know your feet smell so bad that the whole household will be retching as soon as you remove your shoes, please bring some sort of foot spray or deodorant, or better still a stout pair of slippers, and ensure nobody has to endure your pungent trotters.
Don't sit on the only toilet for an hour when your daughter has just returned from hospital after giving birth. And replace the toilet roll when it has run out.
If you are so drunk that you urinate on the sofa, please ensure all saturated cushions are taken to a professional cleaner the following day to be restored to their original freshness.
If you know your asthmatic housemate has an important exam the following morning, please don't invite all your strange Norwegian friends round when the clubs close at 2am, and proceed to have a loud jamming session with out-of-tune guitar and bongo drums, while fag and hash smoke drift up to her bedroom.