I was a waitress and bartender for years during and after college.
I thought I knew how to be a good customer. Turns out I may have been doing one thing wrong.
No Pre- Busing, please.
And no grabbing off the tray...
Don't even think about trying to chat up your server for more than a minute.
Read more about the 5 most annoying things a customer can do in a restaurant from TIME: