Siegfried: "If you're after the sword, don't expect to get past here alive. Sorry to keep you... you're up next!" Nightmare: Ahahahaha! The time is ripe... You shall become part of me. You are my first sacrifice!"
Cassandra's SCIV ending. Not only does she manage to defeat Algol and destroy Soul Edge, she also manages to break up Soul Calibur with her own hands. Too bad it's non-canon. But the best part has to be this: