Sam : Hey, Stinker! Don't go getting too far ahead.
Frodo : Why do you do that?
Sam : What?
Frodo : Call him names, run him down all the time.
Sam : Because... because that's what he is, Mr. Frodo. There's naught left in him but lies and deceit. It's the ring he wants; it's all he cares about.
Frodo : You have no idea what it did to him... what it's still doing to him. I want to help him, Sam.
Sam : Why?
Frodo : Because I have to believe he can come back.
Sam : You can't save him, Mr. Frodo.
Frodo : What do you know about it? Nothing!... I'm sorry, Sam. I don't know why I said that.
Sam : I do. It's the ring. You can't take your eyes off it; I've seen you. You're not eating. You barely sleep. It's taken ahold of you, Mr. Frodo. You have to fight it.
Frodo : I know what I have to do, Sam. The ring was entrusted to me. It's my task, mine, my own!
Sam : Can't you hear yourself? Don't you know who you sound like?
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From: The Lord of the Rings: The Two Towers (2002)