Many, many years ago when I was in college at the University of Rochester, I found a paper in the computing lab with the root passwords for about twelve machines at Stanford. I emailed them and told them I'd destroyed it but that they should be much more careful. I got yelled at.
If they were keeping their only copy at an unrelated University thousands of miles away, they had more problems than I thought ;)
I'm actually not sure anymore what the details of their return email was, as it was over 25 years ago. But it was basically, "We will report you to law enforcement if you contact us again."
