Argh... just thinking about this makes me mad... I started a new file in the third empty slot in TP for a three heart challenge. Above this file was my CLOSE TO FINISHED 100% completion file and above that was my first playthrough file. I hadn't even gotten through the Forest temple when I stopped to save for about, oh say, the fourth time. At the save screen, I realized that two files had three hearts in them... I had, at some point, unknowingly saved my newly started three heart challenge over my nearly 100% completion file -_-
Then there was a time in OoT. It was my first time picking up the game in years, so I sat back, took my time, and basked in the glory and awesomeness of the timeskip scene and Rauru's speech. Afterwards I headed to the forest temple and got about a third of the way done. I was playing the game late at night on my bed, so I accidentally fell asleep and later woke up to find the game frozen, that creepy music still playing. I had to restart, obviously and watch the timeskip again, which made it a whole lot less epic than the first time....
I really do not have good luck in these darn Forest Temples....