Goombas are so much more than their common portrayal as easily vanquished stomp cushions would have you believe: they have other skills, like cleaning the house.
That's right: someone made the inevitable leap and combined the Roomba robotic vacuum cleaner with the Goomba and created... well, the Goomba Roomba, presumably.
The video below shows the little wonder in action, along with customised Octorok and Red and Green Shell Roombas too. Just make sure you notice when they clean the house or all Hell will break loose next time you leave them alone.
Oh, and don't stomp on them. That really doesn't help.