To my complete delight, I recently learned that my employer keeps a ping pong table (and paddles and balls) available in a large, otherwise empty office. Whether it's at your work or in your home, this kind of bulky piece of furniture can merit the space it takes up by virtue of the entertainment it provides.
I grew up with a ping-pong table occupying half of my basement, and it gave my brother and me hours of entertainment and many funny memories. (A favorite family story is how I spoiled the surprise by coming down at midnight on Christmas Eve, complaining of sleeplessness, as my parents assembled the table.) In turn, to me pool tables shout "man cave" and "bachelor pad" — then again, I am no good at pool.
This game furniture isn't exactly suitable for small space living, but if you have the room, it can be a fun, family-friendly investment.
(If you live in DC but don't have a table, there's always Comet Ping-Pong — just avoid the early rush.)
Have you ever had or would you consider buying a ping-pong or pool table?