The Tipping Equation – The New York Times
Here is an interesting story about tipping from the New York Times
It was a woman, a man and their two children. She had walked their daughters to the bathroom. He grabbed my hand and said: “I want you to know you are so beautiful. Take this.” And there was a piece of paper in my hand. He said: “You can call me any evening after 9 p.m. She goes to bed.” I wanted so bad to go tell his wife, but he was the one filling out the credit card slip. I needed the $20 tip.
Source: The Tipping Equation – The New York Times