Many years ago when I was at school, I found a paper on a table in the computing library with a list of root passwords for some of the machines at Yale, just sitting there. I tried one and it was valid (this was the old days when remote root logins were a thing). I sent the admins a message telling them, and I was entirely ignored. A month later I tried the password again and it was still good. Luckily for me, I guess, it was before the days of suing people for trying to be helpful.