Obvious answer is something like a washing machine or dryer, but for something off the beaten path I would go with our shuffleboard table in the basement. I have a sophomore in college and a junior in high school, and we play it all of the time as a family. As the kids have gotten older and are doing their own things, that family time that they actually want to spend together is pretty priceless.*
*edited to add that if anyone is in the market we are happy with this one:
Olhausen doesn't just manufacture game tables, we make dreams come true
www.olhausenbilliards.com