...Now we get to the Karma thing: You make yourself so vulnerable by not tipping well or treating people in the service industry with respect. Not only is it wrong to treat another human being like that, but there's a practical consideration: They're standing between you and eating. Without waiters, nothing comes to your table and nothing goes away. Aren't you worried that they'll put rat poison in your food, or at least spit in it? pages 86-87