Originally Posted by Christian Benteke

Even in your house, if you keep a bat or hammer by your bed, someone breaks in and you attack them with it, you need to prove the weapon wasn't there for the purpose of attacking an intruder, so if you had the hammer on a table next to some nails and a frame you could just say you were planning on putting a photo frame up. If you run through the kitchen and grab a knife from the draw, you're fine. If you keep one by your bed, you're not.