Get straight to the point with ThinkGeek's Abusive Stamps.
Break out your inner BOFH and let your true feelings come forth, into an ink pad, and onto some paper. All without the safety of using acronyms! It's absolutely cathartic. Some tasks in the workplace are just so unbelievably prosaic and pointless that it's only fair you occasionally are enabled to call a spade a spade. And you get to do so using advanced language skills in the process!