I tried being a waitress for like a week and it failed horribly. It was for a family owned business and the guy was originally a CEO for a tech company so he had no idea how to run a restaurant. I would work from 9AM - 12 AM with zero breaks because he couldn't schedule for shit. But in that week I really started feeling for people in that industry so now I usually tip like 40% and if I have the money I'll tip more.