Sucks. I spent too much time in the restaurant business and people can be asses for sure. All of THIS, just gives them an excuse to ramp up what they were probably going to do anyway (stiff the server leave a mess, etc.).

Speaking of messy, don't ever get a server started on people who bring in their young children and cheerios that end up with more in the carpet than in their kid. If you do this, please stop forthwith.