Bookshelves that re-sort themselves under a different system whenever it senses the owner has become too familiar with where to find specific books.
A dining table in which the dinnerware is at war, staging pitched battles overnight when nobody is watching, but the aftermath of which is observed the next day as a mess of crockery and cutlery, usually intact but with occasional damage such as a bent tine or a warped plate.
A bed, paired with a bed in another location, that makes the sleeper share the dreams of the sleeper in the other.
A mannequin in an overcoat. When you remove the overcoat, it is dressed in a complete outfit for you to wear, appropriate to whatever you plan to do next.
Chairs that hide behind curtains whenever a stranger enters the room and need to be coaxed out with promises of a fresh coat of polish made from wax from the Gold Sun.
Lamp made of firefly-like creatures that you need to feed hot chillies to make them illuminate.
Couch that steals and eats pocket change and small objects and then burps/poops them out at inopportune times.