Coffer

Coffer [noun] (kah fuhr)

1. Strongbox
2. Large chest for money

--

At first glance, the below box would appear to be a coffer.  Upon further inspection, however, the box would prove to be a machine that turns itself off, also know as The Most Useless Machine Ever: 



The good news is that you can make one yourself, via Instructables. Time to have some useless fun!