In August 2013, the Mars Rover Curiosity had been on the red planet for one year, taking over 70,000 photos and studying samples of the soil. On it's birthday, NASA had programmed the lonely little drone to vibrate at different frequencies so it sounded like the robot was singing Happy Birthday to itself—208 million miles away from home.
If you click the source to this article, you can find the video and listen to the sounds that the Mars Rover made to celebrate it's incredibly lonely birthday. Be warned, it's incredibly sad to imagine a sad little robot singing to itself.
