There's quite a few very emotional scenes, I can't decide which is the most touching:
- The scene when all forces unite to battle the Giant of Babel in FFIV
- The death scenes in FFV
- The ending of FFVI
- The scenes with Aerith's theme playing in FFVII (the music alone makes them quite sad)
- Squall's encouraging speech to everyone when Balamb and Galbadia Gardens were fighting on Disc 2 of FFVIII (just before Balamb Garden crashes into Galbadia Garden)
- The ending of FFIX
- The ending of FFX
- The Thousand Words FMV and the scenes after it in FFX-2.