KC posted a wonderful MOOWA entry showing how to set Outlook Web Access (OWA) that takes on a Cow theme AND it MOOs when you receive new messages.
OK so this has nothing to do with security but I had to share it.
Thanks to KC for sharing and also supplying the following image.
That's superb. Reminds me of the days I used to have JetAdmin play a "Feed me Seymour!" sample whenever the printer ran out of paper (it was great, I could hear it from anywhere in the office!)