This app was mentioned in 1 comment, with an average of 7.00 upvotes
Hm, do we count random Android games?
In that case, a "legless robotic sumo wrestler".
Seeing how they work, I guess I can just tip him over - but I'll be patient, he'll probably do it himself.
Source: https://play.google.com/store/apps/details?id=com.ManEntertainment.RoboSumo&hl=en