Bring Us Your Most Uninviting Ideas

How to deter curious co-workers?

If you keep a folder of important/embarrassing material on your computer’s desktop (or I guess a real desktop, even) and want to make sure that no one ever opens it, what’s the best name to give the folder?

“Actuarial Test Prep” maybe? Suggestions, please. Also, does anyone know the name for this dilemma?
 
ADDENDUM: Thanks to Sam for providing the name of this scenario: steganography.