Phineas, watching The Return of the King:

“He has to serve him forever.”

“Well. Until he dies. That’s what ‘service for life means’.”

“You can’t serve someone who’s dead.”

“What if you did have to serve someone who was dead! How would you even do it?”

“Well, I guess that’s what they call ‘being alive’. Because they wouldn’t be able to give you any orders.”

“Because they’d be dead.”