Shake Shack customer hits 'no tip' at kiosk, then watches prices jump in viral video

The Utah man behind a viral video appearing to show prices increase at a Shake Shack kiosk after his wife declined to leave a tip says he initially didn't believe her when she told him what had happened.

Brian Powell, 45, told Fox News Digital that he and his wife were waiting to catch a flight out of Salt Lake City when she purchased three milkshakes from the airport's Shake Shack location.

"My wife came to me after buying some shakes and said, 'They charged me more after I didn't...