Scariest FF moment

For me I'd have to say in FFX when the ghost of Jyscal Guado tries to leave the Farplane. It really creeped me out! The whole Farplane event itself was quite disturbing to me actually with the whole seeing & talking to your dead loved ones that aren't even really there and do not talk back.

All of Sin's appearances would be a close 2nd, and the FF7 Nibleheim Mansion flashback would be 3rd. That mansion is scary - so scary that I literally shit my pants the first time I played through it...okay maybe not, but still.