No, I will not give you an A!

As the semester comes to a close, I am faced with the unpleasantness of grade negotiations. No-I don't let students negotiate their grades, but that does not stop them from trying to sweet-talk their way to a better grade. I'm sure I'm not the only one to face this issue each semester, but I am curious how other people handle it. I find it interesting that students want a better grade, but they generally have no real reasons why I should change their grade. If they would come to me with some real reasons, I would consider it (maybe). They don't think about what they could have done during the semester to avoid this situation. I've lost all sympathy for the students who approach me about this. Sometimes I feel like a hard***, but all of this would be pointless if we gave students the grades that they want, instead of the grades they earn. How do the rest of you feel about this situation?