Judgemental Waitress

I guess this is a "skill" that I have developed from years of people watching.

I have the insane ability of judging the type of person sitting in front of me. I can usually tell as people are being sat in my station how hard they are going to make me run and how much they are going to complain. And I am usually right.

There are a few things that can't help but notice.
People who talk to the door server are generally nice people out for a good time. These people will be easy and fun to wait on.
People who don't smile as they are being sat are already in a bad mood. If the smallest thing goes wrong during their meal, it will be made into a major disaster.
When I greet a table, some people don't even say "hello". When I ask how people are doing and receive "Water with Lemon" as a response, I can tell that this is going to be a long hour.

ok - now those are just some small examples. Obviously they are not the only telltale signs. However, these are the first things I notice.

As a silly little game, actually more of a defense mechanism against that let down feeling you get when someone leaves a bad tip for no reason, I try to guess the tip amount before I go to clear a table. 95% of the time I am right.

I try really hard not to be judgemental, and I greet everyone the same no matter what sort of feeling my gut gives me, but people are just a little too predictable.