WATCH: Shake Shack prices surge after a customer hits “no tip” at one of the fast-food chain’s kiosks. A Utah customer recorded the test after his wife said th

WATCH: Shake Shack prices surge after a customer hits “no tip” at one of the fast-food chain’s kiosks. A Utah customer recorded the test after his wife said the same thing happened to her. Two shakes initially listed at $5.99 jump to $6.49 after “no tip” is selected and a pricing update appears on …