I hate it when someone come and complain about how bad their days are. Ok. Admit it. I'm not a good listener. But seriously, when you yourself got your own problems yet to be handled, the last thing you will appreciate is getting struck with another.
Mentally or physically.
So if you ever want to start a fuck-my-boss-is-such-a-bitch conversation, why don't you first start with;
"Hey! How's your day, beautiful?"
And please make sure that he really is deserve that 'beautiful'.