I hate when I'm crabby yet am still forced to make jokes with the regular customers.
I mean, god forbid I don't have a smile on my face, then everyone wants to know what's wrong, or makes a comment about how cranky I am, which just makes me even crankier.
If your regular cashier looks like she's had a hell of a night, don't make it worse by commenting on it.
It may be hard to believe, but sometimes I just don't want to be at work dealing with people. I'm either tired, or just don't feel like talking that day. When I answer you back with one-word answers, don't get louder trying to be funny in order to make me laugh. I'm not in the mood.
That's all people did today, annoy the fuck out of me. No one did anything in particular, except my co-worker because she's old and becoming senile, but that's a daily thing with her.
NOTE: If you notice your cashier just doesn't look like he/she wants to talk today, he/she probably doesn't. Leave him/her alone. Don't ask a million times what's wrong. It's probably none of your business. So instead of being labeled as an annoying customer, just pay for your stuff and get out.