Where are your jibes now? Will you laugh when my Hell is on Earth?
Who: The Master (Mark Metcalf)
Source: Episode 1.12 "Prophecy Girl"
Note: Character is a vampire who says this to Buffy before she impales him with a large piece of wood, killing him. Was referring to the fact that he had opened the mouth of Hell, allowing creatures from Hell to come through into our world. However, his death caused the Hellmouth to close, and the creatures that had entered our world to be banished back to Hell. Was also referring to Buffy's insulting jokes at his expense while they were fighting.