Microsoft Word and most likely a bunch of other word processing programs now come with something called AutoCorrect. When a common misspelling is made, it checks a list for it, and makes the corresponding correction. Example, it would change adn to and. The magic of this is that it is user editable! Hop onto your co-workers workstation, load up their word processor’s AutoCorrect list, and let your imagination run rampant. First start with the small, but most aggravating ones by reversing what is already in the list, change the corrections to the misspellings! Then move to even more humorous stuff like company acronyms, people’s names, it’s endless! Then watch to see how long it takes before they switch the blame from their own typing, to the word processor, and eventually to their sick minded co-worker… you!