I heard that in FFVII if you where really nice to Aeris and where really mean to Tifa (not just in dialogue, but in battles too) that when the time comes for Aeris to die, place Tifa in your team, and just after Cloud does his "what are you making me do?" line, Tifa, will charge forward and try to kill Aeris, and at the same time Sephiroth will fly down like normal, but because of Tifa's attack on Aeris, the characters are in such a positon that Sephy will end up killing Tifa by accident.
Stupidly I actually tried this, even though I knew it was a blatent lie. I just had to be sure![]()