Great post Shnappy. I agree, the begining of MM obviously shows the darkness in the game, while TP's intro is happy and normal. Ocarina of time's intro is kind of the same way, besides the omen of a dream Link had the night before. Overall, MM is much darker, and will probably be the darkest...
Majora's Mask. It was very dark indeed. To this day, the theme song still kind of scares me. The fact of the whole world going to blow up was always a scary thought.