Can your clock curse? This Super Electrofluorescent Profanity Machine can. It's created with Cold War-era Soviet vacuum fluorescent tubes and generates one random four-letter pronounceable word per second--including the ones that would get your mouth washed out with soap as a child if you were caught speaking them aloud. Any combination of letters that can't be pronounced won't be displayed.
The Super Electrofluorescent Profanity Machine is an odd-looking clock, and would look far more at home in a mad scientist's lab or an austere office than a bedroom.