I technically graduated from high school in the fall, but walked with the rest of my class in May. During the in between time I'd taken a little second job at a tiny coffee shop right between my school and my home, it was a few nights a week, I mostly did it for free coffee and tip money.
The owner of the coffee shop employed a good amount of graduating seniors, all from the same high school, and when graduation night started coming up we all were asking for the day off. About two weeks before I'd had my ceremony for my AA degree and my boss had happily given me the night off and wished me well (even gave me a congrats card!), so I assumed it'd be no issue for my HS graduation. So when the new schedule came out I was surprised to see I was working grad night. On my break I went and talked to her and explained I would not be working that night, I was going to my graduation. She told me "You already graduated, this is just a ceremony", I said yes, but it was an important ceremony and I was going to which she responded "Well, you're a grown up now, and your work comes first. Everyone else wants the night off, so you gotta work it. You need to show your loyalty to me and to this company". I walked away from her, grabbed my bag and went to the bathroom to change out of my uniform shirt. Which I handed back to her and said "I quit, my loyalty is to my family who have waited 13 years to watch me walk across that stage" and walked out. They went out of business a few months later so guess no one was all that loyal.