A good reference to send them to is the audio from Beyond Hope, (they had a social engineering panel at this one). The person doing it calls a computer shop and finds out the password to the machines in the building, if I remember correctly ends up on the PA system at K-Mart...and a few other fun things that will get the point by to ANYONE that it is easier to exploit a human being than a computer.

http://beyond.hope.net/

Hope this is more of what you are looking for....
Cheeseball