The silliest things that I have done is in the FIFA series, specifically the career mode element as I have only completed a game save, maybe once or two. My problem was I picked a team that was already really good, or one that I was not interested in so the game became very boring, very quickly. That meant that I would just start a new one and never actually have enough seasons completed to do something that worthy as a manager.
Maybe now as I am older I would try things differently, but sadly I have not bought FIFA in several years now.