KATHY: When I was in middle school, I worked weekends at Nanking, bussing tables, getting drinks for customers, seating guests, and grabbing checks. When the line got ridiculously long, that was my cue to start selling Tsingtaos to people eagerly waiting to get seated. It was good business: nine times out of ten, people would buy one (or even two or three) to help make waiting in line more enjoyable, and I got some generous cash tips. The forty or fifty people outside, laug