Interoffice politics can get pretty heated at times, I should know. I once stabbed a man with a paperclip. For the ultra-paranoid, or office with a rabid kleptomaniac is this Anti-Theft Coffee Cup. It requires a key to be used. Plug the key into the hole and it can be filled. Leave the plug out and prepare to be humiliated after pouring scalding hot coffee all over yourself.
Anti-Theft Coffee Cup [Gearfuse]