Out of all the reasons to get fired for. Dang I'm sorry to hear that OP, but things will get better though just stay positive you'll find a job in no time.

We don't know details like WHERE you worked, but if you work where your face is seen and you're supposed to be providing customer service, not smiling at customers means the overall rating of a business gets lowered. That's why advertisements like to say "number one in customer satisfaction" and all that. Even if you're tired on particular days, try to at least apologetic for being out of it.

Are u the grumpy cat? If u are then it's not your fault take him to court lol

At will employment Sucks. Join a Union, won't ever happen again.

Sounds like something that would happen to me...

I have the same problem and fear for my job everyday.

And what exactly was this job? If you were a hostess at a restaurant, that might make sense.

Grumpy people need too work too. This is mood discrimination!!! :P

if they didn't have a legit reason to fire you, you might be able to get severance pay... you should see a lawyer

Clearly you weren't wearing enough flare