After I finished OoT (Ocarina of Time), I cried once the credits rolled (specifically when Malon starts singing Zelda's lullaby) because I had finally finished the game. It took me so long to finish it and once I did I was happy and sad. Happy that I finally finished the game, but also sad that I actually finished it and no more to do. Good news was that I had the Master Quest to cheer me up :D