It's an extremely elaborate way to press Enter.
You flip the two switches, turn the key, lift the lid and push the red button. A red light starts to flash, and once it stops, it goes… [Enter]
Perfect for deploying code.
See also the project page on Hackaday.
The device is actually a USB hub that I bought from Japan. But all it did was play a sound effect. So I modded it to register as a USB keyboard and hit Enter instead of playing the sound. Much better!
Teensy is how. Inside the device, I cut the wire to the built-in speaker (it was red, so it felt a bit like defusing a bomb) and attached it to one of Teensy's analog inputs. I then wrote a simple Arduino sketch that reads the input value (basically the sound sent to the speaker) and hits [Enter] at what would've been the end of the explosion. That's also right when the light stops flashing. Makes for good suspense.
I could't think of a single reason not to.
They're unfortunately sold out and very hard to find. They were made by Taro Shooten, two Japanese guys who make handmade toys. I got hold of mine from the Japanese Amazon, but it was the last one they had, and I haven't seen it anywhere else. Maybe try Ebay?
The publisher of the thing is Cube Works. They have more information and a slick video of the device on this page (select Taro Shooten and scroll down).