The librarian
Her trick
Buried under a mountain of paper and requisitioning another file cabinet monthly, the librarian prints out each revision of every sensitive document. She steadfastly refuses to shred old confidential documents, yet can't find the key to secure the drawers full of today's secrets and yesterday's liabilities.
Your treat
Arrange a visit from the records management department, and suggest there might be unlabeled information from former business partners mixed in with other sensitive information in contravention of information classification policies. (Be sure to buy them a beer afterwards.) For sheer meanness, file a request for a slightly smaller desk, or surreptitiously modify a section of the cubicle wall so that additional cabinetry and shelves won't fit.