Always loved the scene at the end of disc three of FFIX. How rather evil Kuja comes across with the theatrical flair that he has. For example:
Now, it's your turn... Should I kill you quickly to show my appreciation for all you've done? Or should I kill you slowly and painfully to show you my love... Oh, I've got a great idea! How's this? I'll make you pillars for my castle! You'll all decorate my castle as a symbol of my eternal kingdom... How do you like that?
There are plenty of others, but just to throw another one that hasn't been mentioned into the mix:
Who you callin' Mr. Barret? That don't sound right!