At most places I’m out the door before they would even have a chance to see what the tip was. So I guess they would just need to chase me down in the parking lot to inquire why they got stiffed.
Slightly OT - Many years ago, on a cold January afternoon, a waiter at a Chinese restaurant in Cambridge, MA, chased me down the street to complain that I left a 10% tip instead of a 15% tip ... on a meal that did not cost more than $20 if I recall correctly.
