I worked at this particular company for 10 years.
One of my colleagues had been there for 25 years and had a perfect record, literally, Never took a sick day or was late, once in all that time.
We had to work weekends, as part of our contracts.
He asked for a Saturday off to attend a wedding and offered to take it as unpaid leave.
He was told no by his section manger, a weasel of a man.
He wrote a strongly worded letter to the big boss, who to be fair, rained down fire and fury on the section manager for his refusal.
But the damage was done and my colleague handed in his resignation.
25 years of perfect service and turned down for an unpaid day off.