The moving sofa problem
Nancy the Van Seat [1] was a mobile robotic platform developed at the Stupid Fun Club that was useful for performing moving sofa experiments, but we never tried taking her down a staircase!<p>[1] <a href="https://www.youtube.com/watch?v=fvXG4gQ2FWI" rel="nofollow">https://www.youtube.com/watch?v=fvXG4gQ2FWI</a>