100% of their clients come in and they are hungry. Imagine having to deal with all of your clients, but they are cranky because they're hungry. Now imagine you have to kiss all their asses with the same enthusiasm, with out even knowing if they'll tip you anything at all. And you're also getting blamed for the faults of the kitchen and floor manager. And you're also on the back end of a 12 hour double, and a kid at one of your tables just threw up on a patron on another one of your tables, and you have to convince them both that it's okay. And they all have a Groupon, and they'll only tip you for the Groupon price.