At one of my old jobs, immediately after being hired the sys admin(aka some random HR person of questionable intelligence) made me an account for their computer systems. They informed me that everyones username was the first letter of their first name them their lastname, for example: "dsmith". And then they told me that my password was "pass123", the same as everyone else including the store manager becuase she felt it was easier for everyone to remember that way. So I thought any time I wanted to I could just login as a manager and give myself a raise or as the sys admin and do anything I want?
I found this so amusing that I literally laughed out loud. I never brought these concerns to anyones attension though, because I didn't particularly care for the company.

It was actually a large company not just some little small bussiness.