9. You'll Have Left Something That You Need At Their House
This is always going to be awkward because they'll think that you're using it as an excuse to go around and although some of you will use it as an attempt to see them, others really just want to be reunited with their jumper. But you still have their spare key and you're not sure whether to use it. You could go in and out without them noticing when you know that they're at work, but does that not cross some moral boundary? The polite thing to do would be to let them know that you're coming over at a time that best suits them, but that would mean that you would have to actually talk to them and look at their face. That jumper can wait.
