the.com/gratuity
a voluntary thank-you that somehow became a mandatory math problem at checkout.
latin rootFrom gratus, meaning pleasing or thankful.
once illegalSeveral U.S. states banned tipping around 1900.
tip mythNot actually an acronym for anything historical.
screen creepTablets now request tips at self-checkout kiosks.
global oddityTipping can offend servers in Japan.