It's bad to not complete assigned projects.
Jim has a 20 page research paper due for his English class the following day that he hasn't finished, but he also has a new video game.
Jim wants to play some video games.
Jim decides to work hard to finish the paper quickly, so he can squeeze some games in before bed.
Jim decides to spend the day gaming instead of doing his paper.
Jim ends up getting a good grade on the paper and passes the class.
Jim gets an F on the paper and ends up failing the class.