A Shake Shack kiosk appeared to inflate the price of milkshakes after a customer selected the "no tip" option. The viral video reignited tipping debate.
https://www.foxnews.com/food-drink/shake-shack-customer-hits-no-tip-kiosk-watches-prices-jump-viral-video
https://www.foxnews.com/food-drink/shake-shack-customer-hits-no-tip-kiosk-watches-prices-jump-viral-video