Got fired on my first week. I was in high school, and during the interview I told the manager interviewing me that I could only work 20 hours a week. I didn't mind 8 hour days on weekends but during the week I couldn't do it.
As soon as training ends, the schedule comes out and I'm scheduled to work 39.5 hours with several 8 hour shifts on weekdays after school.
I went into the manager's office and told him that I couldn't do it, that it was against my availability.
He said, "This is why we hired you. Your availability is what we tell you it is. Either do it or you're fired."
Well... That was that. I gave him a sweet smile, thanked him for wasting my time, and walked out.