A Twitch streamer going by the handle ATwerkinYoshi did a little modding after a grocery trip and managed to turn seven bananas into makeshift buttons, enabling anyone to play the latest installment of Super Smash Bros. Ultimate.
ATwerkinYoshi's set up hinged primarily on a Human Interface Device (HID) called Makey Makey. The simple tool converts basically anything into a keyboard input.
In this case, he hooked up bananas to the board so tapping one of the fruits would be interpreted as a button press. He then used an input converter to change those perceived keyboard actions into button presses on a Nintendo Switch Pro controller so it would be recognized by the game.
According to an article on engadget.com, it's a much cheaper set up than buying a Pro controller, though a Pro controller will never get too ripe to play with.