A guy named Mark Gibson has put an atomic clock inside a pinball machine, making one of the coolest clocks ever. It’s a WWVB atomic clock using a pinball machine marquee. What used to be the score is now the time, with atomic clock accuracy.
The downside is that it makes a lot of noise. If you want to build one, Mark has detailed instructions for building the atomic pinball clock here. It is a difficult build, but worth it.