favourite quote, phrase or oneliner? →
Could be more than one. Not necessarily book-based, or snark-based either.
I remember loads of witty aphorisms from various movies/books, etc (Monty Python, Jean Shepherd, Terry Pratchett, Office Space, just to name a few).
However the one that sticks in my mind most frequently is this one from an obscure Tad Williams novel:
"Oooh, an argument! Can I play?"
Mainly because I've been able to borrow it more than once to defuse tense situations. Which can't always be said for Princess Bride references, no matter how awesome they are.