I started my first and only job at a movie theatre when I was 14, and my boss had me cleaning up till 11 PM on school nights. I didn't seem to mind, besides the fact that I worked holidays (Christmas Eve, Thanksgiving, New Years Eve) when I was still in Junior High School.
Then I had to tell friends and family not to eat the popcorn, since I found out we bagged it and used it the next day. We didn't throw it out and make a fresh batch for around a week.
Then my boss tried to get me to admit my friend (and fellow employee) was stealing money when she wasn't.
Yelling at me for not doing things I wasn't taught how to do, dropping grades, working 7 days a week since there was only 3 of us, and pressure from my Mom was too much for my 14 year old mentality. Exhausted, I called in while they were getting ready for the busiest day of the week and quit.