Usually when you play games you don't really get all that emotional, much less sad. However there are some moments in games that manage to really tug at heart strings, and to make it worse the ones that do it the best come out of nowhere and hit you like a brick. For me the one thing that sticks in my mind is the ending of Legend of Zelda: Skyward Sword where,
Link has to give the Master Sword and Fi to the stone and end their companionship. This was really surprising for me as I never really cared for Fi one way or the other. The music didn't exactly help either....