Heartwarming: The Legend of Zelda: Link's Awakening
There is the scene after the credits in Link's Awakening where it is implied that Marin's dream of becoming a seagull and flying away from the island comes true. But only if you complete the game without dying once.
The picture you can take at the mysterious ghost's gravestone in the DX rerelease. After escorting the sad ghost to its former home, watching it cry from the nostalgia of its decrepit house, and then taking it back to its grave, it's nice to see Link could finally give the ghost a reason to smile.
How about the talk between Marin and Link on the beach? And all the fun things they can do together after that, like get their pictures taken or play the trendy game? It's disappointing that without a glitch or cheat you can't keep Marin in your party forever.