New Challenge: Favorite Lines

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Happy September! The Wilderness Challenge is over.

And now for something completely different.

Let's talk about our favorite lines. Do you have a go-to line for a character, one that just perfectly captures who he/she is? Maybe it's a description that takes your breath away every time you read it -- or maybe it's a line from the actual show.

Whatever lines you love, share them in comments -- along with either a note that it's canonical (the specific episode would be nice but not required) or a link to the fic it came from.