I have recently been lecturing an I.T course at Mercedes Benz South Africa. I was continually astonished at the high level of security throughout the plant. I had to go through various security checks each time I entered the property, and even when I left.
They are not only pedantic about what physically enters and leaves the plant, but also the handling, storing and dispersing of information.
One of the more humourous pieces of advice was a sign displayed in the IT labs which stated:
Passwords are like Toothbrushes:
1) Don’t share them with anybody
2) Change them every few months
3) Don’t leave them lying around