Back in the day, corporate Human Resources would send the “CONFIDENTIAL” annual salary increases to the branch manager where I worked.
Confidential as in sittrin on the fax machine in the printer room addressed to the person who was actually in the office the least.
We had great fun with that!
In the early days of computers I worked for a large company that had an employee hack into their HR system.
They printed out the full salary list and mailed it to random employees all over the company (from home addresses on the list).
Management went ballistic—it was fun to watch.
The hacker let them howl and scream for a couple of months looking for him—then quit and confessed in his exit interview.