Maybe you don't like your job maybe you didn't get enough sleep well nobody likes their job nobody got enough sleep. Maybe you just had the worst day of your life but you know there's no escape there's no excuse so just suck up and be nice.
There are a lot of movies I'd like to throw away. That's not to say that I went in with that attitude. Any film I ever started I went in with all the hope and best intentions in the world but some films just don't work.