Door That Converts Into Table-Tennis

Part of Wonderful Engineering home improvement ideas, this is simply cool. More info here.

The table tennis door is a door that swivels down from the frame and creates a make-shift ping pong table right in the middle of your door frame. It looks just like any regular door, with a door handle and even a key lock, except it is bright green, has a stripe down the middle of it, and has a net attached to it across the middle of the door, but when you swivel it down, it magically becomes a ping pong table (except not quite regulation size). Designed by German designer Tobias Fünke Fränzel, the ping pong table is perfect for space saving connoisseurs, and although the price is quite hefty, you a man could probably just make one for you if you know of one. If anyone were to start a kickstarter campaign for a table tennis door cheaper than this one, I for one would be throwing money at you through my computer screen.

For those who enjoy table tennis but have no space to accommodate the set up, the Fold Out Ping Pong Door is a practical solution.
This pint-sized game table is the brainchild of Tobias Fränzel, a Berlin-based designer and artist who specializes in functional home furnishings. On one side, the door is painted an unassuming white with thin black outlines. In contrast, the adjacent side’s playing surface is adorned in a bright green finish with a white accent lines, net posts, and the customary door handle.
The design takes the classic European-style window hinge (originally used to open windows sideways to achieve greater airflow), and utilizes it to create a functional fold-down piece of furniture. Setup is quick and easy, simply flip down the table, attach the included net, and make sure you have enough room for those forehand smashes! With no messy storage or extra space taken up, all you need is paddles and a ball.
Even if the table is not being used for ping pong, it can easily double as a workspace or extra surface when entertaining guests. This cleverly constructed table takes up minimal space while creating a fun and interactive space in your home.