During my stint on a helldesk, I was given the task of monitoring network drive quotas for various divisions to ensure enough space was allocated on an as-needed basis. One division full of financial hi-flyers was constantly running out of room, and always had to have more and more space allocated to them. A wee bit of investigation with the email team also showed that not only were their network shares being clogged up at an unprecedented rate, but their email quotas were being burnt through at a similar rate.
One night, we stayed back and decided to do some investigating. Turns out that most of the people in this department, both male and female, had a thing for watching our equine friends get overly friendly with the bipedal owners, again, both male and female. Snapshots were taken, logging performed, backups, and then came the purge.
Next morning, the boss of said department was on the phone, ranting about missing tons of vital information. Myself and the email admin owned up to purging it as we did not believe it was in the best interests of the company to be harbouring said data. His complain went to our manager, then the overall IT manager, up to the CTO, and then the MD. We were asked to give an explanation to the full board of execs why we thought it best to purge important business data. So we plugged a laptop with samples of this data into the projector in the board room, and displayed in full detail, what this important data was.
I don't know what was more satisfying, the bonus we received for tracking down the "unwarranted business expense", or watching security drag 19 people out, kicking and screaming while we sat in the pub across the road. Probably the latter, as the GM was there as well putting the drinks on his personal card and enjoying the spectacle with us.