Toner hell.

Rule #1 - Make sure you are using the toner for your machine. Toners for other copiers do not work.
Rule #2 - Dont take that strip of tape off until the toner is in place
Rule #3 - Saying "dont come over here" while you are trying to clean it up only entrances the entire office to come and see what you are doing.
Rule #4 - Even your friends wont tell you if you have toner on your face.