Service workers are not shy about sharing their perceptions of who are good and bad tippers, but are those perceptions accurate? This chapter answers that question by contrasting those perceptions with what research tells us about individual and group differences in tipping. The chapter starts with an examination of potential demographic predictors of tipping such as age, sex, race, religion, income, and nationality. Then it moves on to potential behavioral-trait predictors such as smoking, patronage frequency, and work history. Finally, it ends with an examination of potential personality differences in tipping. Ultimately, it concludes that the reviewed group differences in tipping are too small to (i) justify server discrimination against any group, or (ii) support server and consumer inferences about the character of people based on their tipping.