In every office there is one person who when you are in a meeting or see an email and you see that this person is getting assigned a special assignment or project to work on, you immediately know that soon but not immediately you are going to have a lot of work to do, because not only is this person not going to do what they needed to, but in the process they are going to make things harder on themselves in getting it done. And more often than not if you offer to help them from the get-go they will brush you off. If you don't have a person like this in your office its because it's you.