This was more than a decade ago. Someone from HR mistakenly emailed a spreadsheet of all employees’ salaries to a bunch of people who aren’t authorized to see it. As part of my job, my team was tasked to track down all traces of the file on email and company workstations and remove it. Naturally I was able to see the file because of my task. I saw how low my pay was compared to my colleagues and how absurd it jumps up in just a couple of levels in rank. I and a lot of employees quit shortly after.
Not sure how common of an occurrence an HR mistakenly send the salary of all staff, but it happened to my first company more than a decade ago well.
I wasn't able to see it as I was on mid-shift and the email was successfully recalled by the time I got in the office. A team was going through every workstation to ensure that the file was deleted. Fun times.