You Want 20% for Handing Me a Muffin? The Awkward Etiquette of iPad Tipping – WSJ

Countertop payment tablets turn gratuities into a public ordeal; ‘You press the middle button so you don’t look cheap to the people behind you in line’
— Read on www.wsj.com/articles/you-want-20-for-handing-me-a-muffin-the-awkward-etiquette-of-ipad-tipping-1539790018